A boy falls from the roof of a hotel and becomes comatose. Two people question the fall of the boy when everyone has concluded it was suicide. They're Young Jin, a detective from a regional investigation unit who lives on the upper floor of Eun Ho's house, the boy who fell, and Sun Woo, Eun ho's homeroom teacher. The night before the accident, Eun Ho came to Young Jin and said he had something to say. But she was so busy that she just sent Eun Ho away and she regrets it bitterly for doing that. Sun Woo also didn't ask what Eun Ho was going through, although Eun Ho seemed to be getting darker and troubled. Sun Woo blames himself for turning a blind eye to Eun Ho. And Sun Woo meets Jin Young as he was looking for Eun Ho's mother.
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