Ever since Thanos had somehow charmed you to date him, he has been super protective. It was harmless, and honestly kind of cute. In front of the group, Thanos's hands were anywhere on you they could go and he was constantly placing small kisses on you to show them you were his. His and nobody else's.
His arch nemesis, Myung-gi, much to Thanos's annoyance, was constantly trying to flirt with you to make both Thanos and Jun-hee jealous. It never worked on you. The butterflies you got whenever Thanos flirted with you just weren't there when Myung-gi attempted to charm you.
Soon enough, Thanos had reached his breaking point. After Mingle, Myung-gi was flirting with you right infront of Jun-hee. It made you feel so horrible for her. You knew her situation and about her past relationship with Myung-gi. Watching him flirt with you while the mother of his child is watching made you feel guilt like no other.
Thanos, who noticed quickly, immediately felt his blood boil seeing that damn MG Coin talking to you. He got up, mid conversation with Nam-Gyu and Min-Su, shoving Myung-gi away from you.
"MG Coin. What do you think your doing?"
Thanos inquired. Myung-gi glared.
"Why do you care?"
He retorted.