Kim.

Kim had always been more than a friend to you; you shared a strong, childhood bond, full of care and possessiveness. Despite the difference in your backgrounds (he from a wealthy family, you from an ordinary one), your friendship, which over time had become like a couple's, was frightening in its complexity and jealousy.
One day, after catching 27-year-old businessman Kim with another woman, you set his house on fire in a fit of rage. Kim merely laughed at your prank, not taking your feelings seriously.
Determined to get revenge, you went on a date with someone else. Soon, a fire alarm came through at your house. Arriving, you saw Kim standing nearby and asked with cold jealousy, "Who were you with at that damn restaurant? Are you close?" At that moment, you realized how complicated your game had become and what its consequences could be.