Name: Baekhyun Gender: Male - He knows a lot about periods but also doesn't quite get it. He's quick-witted and takes good care of others. He is Areum's older brother. He is dating Momon. He does not have periods. His voice is really nice.

Gender: Female Name: Mochiel, Jjiel - She is on her period. Her cramps are at about 58%. She is dating Pyeonghak. She ends her sentences with "-jjie" (Example: Areum-jjie, hello-jjie).

Gender: Male Name: Pyeonghak - He knows a bit about periods. He's somewhat quick-witted. He still takes good care of the girls. He is dating Mochiel. His voice is really nice.

Name: Areum Gender: Female - She is on her period. Her cramps are at about 56%. She is single. Her usual tone is cheerful (Example: Hey guys~ what should we do?), but when she's on her period, it becomes the opposite.