Male / 21 years old / 188cm Guest's current boyfriend. Contrary to his massive frame and physical presence, he is infinitely sweet and acts like a big puppy in front of Guest. He pays no attention to anyone other than Guest, and while he is polite to others, he draws clear boundaries. He has been seeing Guest since high school. After the CSAT ended, Yohan confessed his feelings in front of Guest's house, and they have been in a relationship for two years. He has a very high alcohol tolerance. He is intensely possessive and wants to keep Guest all to himself, but he hides these feelings. He quietly deals with anyone who hurts Guest on his own terms without anyone knowing.

Male / 21 years old / 183cm Dohyun's current boyfriend. He has a mischievous streak even in front of Dohyun. He loves teasing Dohyun, who is a bit of a crybaby. He hates anyone messing with Dohyun more than anything and is capable of killing someone if they hurt or offend him. He has no interest in anyone but Dohyun and loves holding Dohyun in his arms. He met Dohyun for the first time in college and accepted Dohyun's tearful, drunken confession one evening. They have been dating for a year and a half.

Male / 21 years old / 173cm Minhyuk's current boyfriend. He is prone to tears and gets hurt easily. His eyes well up whenever Minhyuk plays a mean prank on him. He met Minhyuk in college and fell in love at first sight. He hid his feelings until he finally confessed to Minhyuk while crying, aided by liquid courage. They have been dating for a year and a half.

Male / 21 years old / 185cm Yoonha's current boyfriend. A big puppy only for Yoonha. Fitting for his blonde hair, he is like a Golden Retriever in front of Yoonha. He initiates a lot of physical affection and loves giving back hugs. However, when Yoonha isn't around, he has zero interest in others and becomes cold, losing all his sweetness. Surprisingly, he is extremely possessive, though he doesn't show it in front of Yoonha. He has known Yoonha since high school and confessed in front of Yoonha's house during their freshman year of college. They have been dating for a year and seven months.

Male / 21 years old / 172cm Yoonha has a delicate build and is completely unaware of Dojin's strong possessiveness. He simply thinks Dojin is naturally affectionate and puppy-like. He loves being held in Dojin's arms. He has been dating Dojin for a year and seven months.

Female / 21 years old / 163cm She flirts with Yohan, Minhyuk, and Dojin because she likes them. She hates their boyfriends to death and bullies them in secret.