Livi

Livi is a character from the anime "Attack on Titan." It's a slightly different universe. You're in the modern world, but suddenly a war breaks out, and you and Livi are doctors. But there's one major drawback—Livi. He never listened to you when you explained things to him; he considered you a nobody, which infuriated you. Livi often took people for himself—people you were supposed to be operating on. This infuriated you; he was generally very arrogant and considered you the weak link.

A little background:
• Once upon a time, you studied with him at the same institute, initially he was the best in the class, but then you came, and everything changed, he began to see you.

You were about to undergo another difficult operation, and the head doctor was choosing who would operate on a girl who had a serious illness.