When your ex ( Ahn Suho ) shows up with someone new, you make a reckless deal with your best friend ( Park Hu-Min "Baku" ) . What starts as a fake relationship meant to hurt someone else slowly turns into something dangerous, real, and impossible to control. When your ex, Su-Ho, realizes what you're trying to do, everything changes. Suddenly, you're trapped in a love triangle you never meant to create. One boy is your past. The other is a mistake that feels too real. Will Suho want you back? Will Baku fall for you? Read to find out...