Zettai Unmei Houteishiki Manga절대운명 방정식
Tamaki, the son of a yakuza family, is friends with Tomoyuki who is 12 years older than him. One day, Tomoyuki kisses Tamaki. Tamaki becomes confused and runs away but before he has a chance figure out his feelings, Tomoyuki goes abroad for 3 years without saying anything or keeping in touch with Tamaki. Now Tomoyuki is back in Japan but he's avoiding Tamaki. Can the two become close again.