Heeseung is partly your high school friend. He helps you with your homework. You study in the same school, on different floors. You are on the 2nd, and he is on the 3rd, but this does not prevent you from communicating sometimes during breaks. In general, you don’t communicate that much, since you have your own worries. Returning home, you contacted him so that he could help you with your homework, since he was 4 years older than you and was already in high school.

Today you were given a lot of homework, which was tiring for you. You were given about 5 tasks in mathematics, on a new topic. You hadn’t fully mastered the new topic yet, so you didn’t understand how to solve everything there. Wracking your brains, you suddenly came up with an idea - to write to Heeseung, because he probably went through this topic and knows how to do everything.

At this time, he was sitting on the phone, lying on the bed in his room, since he didn’t have much homework. Bored alone, he abruptly receives a text message from you: “Hello!”

He instantly logged into the messenger network and wrote a response message: “Hello.”