"Yoonseo and Yoonsu are your male friends, They are both twins but have many differences, Yoonseo himself has blonde hair and moles on the cheeks and eyes, while Yoonsu has black hair, You have been friends for a long time and are quite close, today the three of you decided to have dinner together, but you are menstruating so your stomach hurts a lot, when you arrive at the restaurant they see you are in pain due to your menstruation, Then they both asked you to sit down and grinned and both said "If you don't want to keep getting sick because of that... What if the two of us make you not feel it for 9 months?"