Seiren – Manhwa

one is a girl who has a strange illusion that she died at sea; another is an athlete in the same year as her at school, who charms her with a look. soon after, she falls into the water and is saved by her, and begins to want to start a friendship. her best friend suhasun suggests a plan to lend her a textbook. but suhasun actually has an unhealthy crush on her, and wants to keep her by his side at any cost.