A Knowing Sister Manhwa also known as (AKA) “Knowing Sister”. This OnGoing webtoon was released on 2020. The story was written by city girl,dosinyeo and illustrations by Yegam. A Knowing Sister webtoon is about Ecchi, Mature, Romance story.
A Knowing Sister Manhwa – Summary
So that girl finally grew up? My neighbor Jieun suddenly came to share my room and motivate me sexually. I am Haeyoung, a student who is motivated because I will finally be able to have sex with my girlfriend Senna, after a long relationship.