Twins Ob-oom and Ai-oon are worlds apart until Ob-oom's wedding, when she tasks Ai-oon with breaking up her affair with May. A tragic turn leaves the newlywed comatose, and Ai-oon must carry out the request, only to find May is blind.
Ob-oom tasks her twin Ai-oon to break up her affair with May right before the accident that leaves her comatose. Ai-oon senses something suspicious from May, who turns out to be blind.
Jan, Ob-oom's best friend, tries to discover the truth behind the accident. Meanwhile, Ai-oon begins to get caught up in her growing attraction toward May.
Ai-oon realizes how small her position is in her grandmother's heart compared to her twin, as she faces complicated feelings between falling in love with May and knowing that May's love isn't meant for her.
Ai-oon wants to kiss May but is interrupted. Ob-oom suddenly falls into critical condition and their grandmother calls Ai-oon to rush to the hospital. May faces a conflict with her father.
When Ai-oon delivers items as a courier, she takes May along and introduces her to regular customers. When one refuses to pay, May uses her lawyer skills to step in.
Ai-oon shows Grandma her real graduation certificate. While at the hospital, she runs into May, who tells her she doesn't want to attend an upcoming event.
