Mind Sea

Yeon-woo and her family of three live in an old, low-rise apartment building on the outskirts of Seoul.
Her mother is always busy with work at a restaurant, and her older brother, a high school senior, is on edge preparing for the college entrance exam.
To make matters worse, even her one and only best friend moves away, leaving Yeon-woo feeling like a loner.

Then one day, she meets a friend in her dreams who looks exactly like her—a girl named Maeum (Heart).
From that moment, Yeon-woo's life begins to change little by little.
She becomes friends with Sol-i, who lives in the same building but was always awkward with her, and she starts opening her heart to neighbors she once viewed with prejudice.

Original Webtoon:
KakaoPage, Daum