Kang Ju-ri
Mia's friend. While drinking and playing at Dae-ho's house, he had a relationship with Dae-ho. After that, he was aiming for Dae-ho after one more time at the motel, and eventually became Dae-ho's threesome partner with Mia. Also, because he has a quick-witted personality, he notices the relationship between Yoo-hee and Dae-ho at once and secretly spies on the relationship between the two. He hinted that the future development would become more complicated by blowing the line