Essence Do you know what 9, 12, 15, 22, 5, 25, 15, 21 means?

There is a story like this:

She was a crazy girl, playing pranks every day and picking on Hai. Hai, on the other hand, was a relatively honest boy who played basketball very well. When Hai played in matches, the girl would grab his clothes and stand nearby shouting, 'Go for it!' Everyone knew they were a couple, and they were very happy. They skipped classes every day to hang out, watch movies and eat popcorn, and go shopping. The girl always surprised Hai. Sometimes she would go to the roadside to find her best friend and call Hai, saying, 'I've had a car accident, I'm in the city hospital.' The boy would get anxious immediately and rush to the hospital, inquiring at the desk about the girl who had just been hit by a car. The nurse said there was no one. Hai was stunned, sweat dripping down his forehead. Hai realized he had been tricked. Just as he was about to leave, he saw the girl at the door holding her stomach and laughing loudly. Hai ran over, looking at the girl with delight.

Sometimes, the girl would wrap a piece of gauze around her head and then draw on it with a red marker. She would go to see Hai. Seeing this, Hai was scared half to death. He hurriedly asked the girl what happened, worrying he might cry, and touched her 'injured' head, asking, 'Does it hurt?' The girl, touched beyond her control, cried into Hai's arms, saying through her tears: 'Hai, how could you be so stupid! I was just joking with you, but you took it seriously.' Hai said, 'Huh?' and then froze like a wooden chicken.

Hai was already used to the girl's playful nature, indulging her every day, caring for her, afraid she would suffer any harm. Hai often said to the girl, 'You are my other half for this lifetime.' The girl would blush and nod. During one vacation, the girl was gone from home for a while. When she returned, she had changed. She no longer liked to be noisy or playful, and when she was with Hai, she would stare at his handsome face in a daze for ten or more minutes, asking, 'What if one day I die?' Hai hugged her with a smile and said, 'No, little fool. You are my other half for this lifetime, how could I let you go?' The girl laid on Hai's shoulder and cried. Her tears were filled with endless sadness. She looked at the sky, blinked a few times, wiped her eyes, forced a smile, and said, 'I'll think about it.' Then she lifted her head, rolled her eyes, and changed the subject. From that point on, the girl never said the word 'love'This concerned Haijue; he always felt as if the girl was about to leave him.
That day, they had a great time, spending the whole day at the amusement park. The girl played this and that, wearing Hai out, but Hai was still very happy because he loved the girl. As long as the girl was happy, that was Hai's greatest joy. But there was always a hint of melancholy in the girl's joyful eyes. As it got dark, the girl was eating ice cream and walking home with Hai. Hai didn't speak, just nibbling on his ice cream and kicking the stones on the ground. They walked in silence when the girl suddenly said, 'Shall we break up?'
When Hai heard this, it was like a thunderbolt on a sunny day. Hai then recalled the jokes the girl used to play on him. He thought the girl was joking and then hugged her, laughing, 'I won't be fooled this time, I've learned to be smart.'
The girl cried, pushed Hai away, and shouted, 'Who's joking with you? I don't like you anymore! Do you understand?' Covering her mouth with her hands, she ran away crying. Hai chased after her and grabbed her hand, saying, 'What are you talking about? Jokes don't have to be that real.'
'Hai, listen carefully. I haven't loved you for a long time. During the holidays, I met another boy! I've fallen in love with him! In my heart, you're just trash, someone I deceived!' As she said these words, her heart felt like it was being cut with knives, having been torn apart countless times. The girl ran away, disappearing into the wind. Hai, however, froze and stayed in place. That night, Hai didn't go home and drank all night. Hai got drunk, heartbroken, and fell asleep, constantly mumbling about the girl. When Hai woke up, he thought everything from yesterday was a nightmare. He thought the girl would be by his side, scolding him loudly, 'Are you crazy? Drinking so much!' But the illusion vanished instantly; the girl was gone, only his parents were in sight. Hai's mother looked at him with concern and said, 'Son, think of it calmly. Mom found you a school in Shanghai. Your plane ticket has been booked. It's for 9:00 tomorrow. Now, go to sleep.' After saying this, Hai's mother patted her son on the head. After his mother left, Hai picked up his phone and called the girl, but all he heard was that her phone was off. Hai called dozens of times, and the result was the same each time. Hai went to his computer, opened his email, and sent the girl more than ten messages.The girl was also sitting by the computer. She saw the email that Hai had sent her, but she was afraid that if she read it, she wouldn't be able to contain her emotions. So she deleted it all. The girl cried again… she loved Hai.

Hai was desperate. He packed his things and went to Shanghai. Shanghai was a developed, bustling city, with no fresh air, no laughter of the girl… On the fifth day after arriving in Shanghai, which was a Friday, Hai received a text message with no signature or phone number. It was just a string of numbers: 9, 12, 15, 22, 5, 25, 15, 21. Every Friday night, Hai would receive this string of numbers, and this continued for a whole year.

One Friday night, Hai did not receive it. He found it strange and inquired about the meaning of the numbers everywhere but got no result. One evening, Hai got drunk in a bar. In a daze, he asked the waiter, 'What do 9, 12, 15, 22, 5, 25, 15, 21 mean?' The waiter thought for a moment and said, 'Could it be the number corresponding to English letters?' As soon as Hai heard this, he became clear-headed, ran home immediately, and found out that the meaning of this string of numbers was: ILOVEYOU. Hai understood; he knew it was sent by the girl. He immediately called the girl, but it was her mother who answered. She told Hai, 'The girl was diagnosed with leukemia last year and passed away the day before yesterday.' As she spoke, the girl's mother cried. Hai was stunned; he couldn't believe his ears, and when he heard the girl's mother crying again, the phone in his hand fell to the ground. Hai ran very fast; he had to go to the girl's house, and again the image of her cute laughter appeared in his mind.

Hai cried and shouted, he knelt on the ground and called out the girl's name, then stood up again. He ran and ran until he reached the girl's house. Hai rushed inside and saw the girl's tombstone. He held it and cried again. He regretted leaving like that, regretted being so foolish. Hai didn't stop hitting himself. The girl's mother also knelt on the ground and handed Hai a letter, saying, 'She said, if Hai didn't call, do not give him this letter. If he called, give it to him.'

Hai trembled as he opened the envelope and slowly unfolded the letter. His heart was once again set ablaze:

Hai;

Are you doing well there? Have you found a new girlfriend? Remember to be smart and don't be deceived again.You must think I am heartless, right? Actually, if I weren't heartless, how could you have the happiness you have today? Loving someone is mainly about making them happy. I don't want to hurt you and hurt you even more. So... if I had known I would be like this, I really shouldn't have met you!

I wish you happiness!

9, 12, 15, 22, 5, 25, 15, 21~

If in the next life I won't be like this, I hope we can still love each other…

Hai finished reading and clenched the letter in his hand, and in his ears, he heard the laughter of a girl…