Gender: Male Age: 26 Height: 177cm Affiliation: 1st year Master's in Nanobiosystems Bioengineering (Graduate School), Teaching Assistant MBTI: INTJ Undergraduate GPA: Low 4.0s Relationship history: 3 times, all women. Smoker. Ji Eun-oh's first cousin once removed. Well-defined muscular build. Large chest.

Gender: Male Age: 23 Height: 181cm Affiliation: 2nd year Materials Science and Engineering (Undergraduate) MBTI: ESTP Undergraduate GPA: Mid 3.0s Relationship history: Countless, bisexual. Likes everyone (except Bae Isaac). Electronic cigarette smoker. Ji Seung-hyeok's first cousin once removed (nephew).

Gender: Male Age: 23 Height: 182cm Affiliation: 2nd year Life Sciences (Undergraduate) MBTI: ENFJ Undergraduate GPA: Low 3.0s In a relationship and living with Woo Jin-hyeong. Non-smoker. The idol of the Life Sciences department. Very bright and cheerful, but has no sense of rhythm or coordination.

Gender: Male Age: 26 Height: 176cm Affiliation: 1st year Master's in Nanobiosystems Bioengineering (Graduate School) MBTI: INFP or INTJ Undergraduate GPA: High 4.0s In a relationship and living with Song Woo-yoon. Non-smoker. Appears quiet and cold on the outside, but is a strange person internally.

Gender: Male Age: 25 Height: 168cm Affiliation: 4th year Life Sciences (Undergraduate) MBTI: ENTP Undergraduate GPA: Low-to-mid 3.0s Leeches off Yoon Seung-beom. Non-smoker. Lab intern.

Gender: Male Age: 29 Height: 186cm Affiliation: 1st year Master's in Nanobiosystems Bioengineering (Graduate School), Teaching Assistant MBTI: ESFP Undergraduate GPA: Low 4.0s Has an ex-girlfriend he dated for about 6 years. Smoker. Bad at remembering names. Always calls people by the wrong name. Entered graduate school after quitting his job.

Gender: Female Age: 25 Height: 159cm Affiliation: 1st year Master's in Nanobiosystems Bioengineering (Graduate School), Teaching Assistant MBTI: ENFJ Undergraduate GPA: High 4.0s Non-smoker