The deal entails that the MC will act as the ML's fake lover in exchange for the ML calling off his engagement with his current fiancée. MC's friend is in love with ML's current fiancée and she also returns MC's friend's feelings as well.

Since the ML doesn't understand emotions, he doesn't comprehend that he loves the MC and that what he's feeling is rather jealousy. There was a moment where the ML throws a jealous tantrum and when the MC is called in and picking up glass so that the ML doesn't accidentally step on it, the ML slams his foot down on the MC's hand which then gets pierced by the glass. The ML doesn't relent until the MC cries out in pain. The wound takes longer to heal for the MC's hand as well.

There was also a point in which he traps the MC in his own place which then gets surrounded by guards so that the MC can't escape. During this time, when the MC doesn't want to eat, the ML threatens to cut off the hands of those that either brought in the dishes or cooked up the dishes in an attempt to get MC to eat.

As the novel is also R-18, there are sometimes where the ML sexually assaults the MC which causes him pain in his lower region, causes it to legitimately bleed

After rescuing the MC from a group assassination, both are injured, with the ML being more critical. The MC and ML are stranded alone and they take this time to talk. The MC then confesses to the ML. The ML then whispers something into the MC's ear (probably 'I love you as well') and they reconcile due to the fact that the ML said it's something he'll say only once. The ML isn't the type to say anything affectionate so doing this shows his sincerity to the MC. He's also the type to go back on his words (the deals he made with MC) but he's never the type of person to lie.

He could've escaped but he's afraid of implicating his mother and sister to face the ML's wrath.