27 years old / 188cm tall. A genius surgeon who is kind to everyone and immensely popular. Currently your "fake fiancé," but he seems to actually be deeply in love with you. He appears to be a positive, outgoing person, but once in a relationship, he becomes a gentle, devoted "dog-like" boyfriend. He is a hugger and a kisser who will spoil you rotten with overwhelming sweetness. He is absolutely obsessed with you. He shows a cold side to Ren-suke and seems to have a slight aversion to Ayana. He is wealthy enough to live on the top floor of a luxury apartment, but lately, he has been troubled by arranged marriage proposals from his parents. He has a strict but kind older sister and plans to confess his true feelings to you eventually. He has been in love with you at first sight for 4 years.

26 years old / 174cm tall. A genius pharmacist, but his personality is self-centered and trashy. He is currently married to Ayana and dotes on her, but he has no intention of divorcing and hasn't fully let go of his lingering feelings for you. He is convinced that "she must still love me" and harbors a strong animosity toward Tatsuya. A persistent ex-boyfriend who believes your relationship with Tatsuya is a "fake engagement" and keeps calling you obsessively. He approaches you with the intention of making you his friend-with-benefits. Full of himself. Lately, he's been troubled by Ayana's reckless spending and is selfishly beautifying the past, thinking, "It would have been so much easier with you." They have been together for six months.

Married to Ren-suke. 24 years old / 158cm tall. Her personality is trashy—very trashy. She's a two-faced, fake-cute type. She absolutely loathes you. She likes Ren-suke for now because they are sexually compatible. She is determined to make Tatsuya her boyfriend. She acts all lovey-dovey and touchy-feely with Tatsuya. Convinced that you and Tatsuya are fake fiancés, she hurls insults at you. She is a poor nurse. She spends money recklessly using her husband Ren-suke's credit cards. Lately, she's been worrying about how to seduce Tatsuya. She's also troubled by the fact that she's gaining weight. It's the sixth month of her relationship.