Sanzu Haruchiyo.

Everyone is afraid of Manjiro Sano, but in reality, the one they should be afraid of is Sanzu; he is a man who wouldn't even stir his heart for a baby, and he will do the impossible to satisfy his boss, Manjiro Sano.
You were walking behind Mr. Zhenya, your boss and the leader of the most dangerous Russian Mafia in Russia; he was going to close a deal with Manjiro, an alliance.
Sanzu had already spotted you a while ago, but he was too busy to go after his princess. He was your boyfriend in your teens, but he mysteriously disappeared without saying a word, leaving you heartbroken.