Yoo Seung-taek

Face the complicated relationship! Tae-kyeong's first love Chae-bin promises to marry wealthy Seok-dae but Seok-dae is actually in a relationship with his assistant... Then one day, Seok-dae's assistant Eun-soo comes around to Tae-kyeong who is in despair! However, Eun-soo looks so much like Hee-soo who Tae-kyeong thought she'd killed.

100 random women VS my friend's woman, which one would you sleep with? Gun-woo and Tae-cheol have different stances. Every night, Gun-woo enjoys sleeping with different women but Tae-cheol dreams of sleeping with the woman he's had a crush on for 10 years. However, Se-yeong loves Gun-woo. Tae-cheol finds out Gun-woo also has feelings for her and tries to give up but he finds himself more and more drawn to her.

Three nights before enlisting, Seung-wook decides to leave his mark since he can't avoid the military so he flirts with everyone. However, his school senior So-yoon nor his blind date Il-hong will fall for him. The night before he leaves for the army, Seung-wook decides he's going to see some action with the two girls. The project of 'leaving a mark' starts now.