Painful Addiction - (HeeHoon)

Sunghoon always believed that no one understood him better than his twin brother, Shihoon. Despite their constant arguments, the two shared an unbreakable bond and countless precious memories together.

But everything changed when Shihoon died in a tragic accident.

While everyone accepted his death as fate, Sunghoon couldn't shake the feeling that something was wrong. His suspicions deepen after an investigation reveals a shocking truth: Shihoon had attempted suicide... and he was pregnant before he died.

As Sunghoon searches for answers, he uncovers the painful reality behind his brother's death. A reality that leads him to one person.

Lee Heeseung.