Shisan Meihua

Thirteen is a mysterious masked assassin antihero and wickedly cute character. The Thirteenth Daughter of the Plum Blossom Swordsman. Having been trained as a coldblooded assassin Thirteen is first seen as a detached and cool headed person but also prideful of her skills. When her mask is broken it shows an easily flustered young woman who seems to have some troubles to completely disregard her feelings of rights and wrongs. Sevenhttps://anilist.co/character/147093/LiuqiWu happens to develop a crush on her after their second encounter and tends to hit on her. When Seven hits on her which is during most of their interactions she tends to act like a tsundere towards him. Source: Scissor Seven Fandom