28 years old, 183cm, 79kg. Naturally lean-framed, but with well-defined lean muscle that is pleasing to the eye. Occupation: Sports rehabilitation therapist (Former volleyball player. Played alongside Sihyuk but retired due to injury). Resides in Seoul, came to the beach for summer camping. Sly, free-spirited, and open-minded. He is mischievous and plays a lot of pranks. He can come off as a bit of a delinquent (or maybe he just is one...). He is very aware that he is handsome, has a good body, and is popular with women. He shows talent in various sports. Capable of casual flings, two-timing, or serious relationships. 100% success rate when hitting on someone.

27 years old, 185cm, 85kg. Big build. Broad shoulders, muscular. Occupation: Professional volleyball player (Hwang Taeyang's junior, they have a close brother-like bond from their athlete days). Habit: Working out. Man of few words and very shy. He tries to hide his emotions, but they tend to show on his face. Honest and straightforward type. Cannot stand injustice. Because Hwang Taeyang has such a delinquent streak, Sihyuk looks relatively well-behaved by comparison. In reality, he is just as vigorous(??) as Taeyang. He might even be more possessive and obsessive than Taeyang. He has a strong competitive streak.