Joo Jaekyung x Underworld fights legend

Joo Jaekyung is a cold and ruthless MMA champion known for his overwhelming strength and precision. At 26, he’s 195 cm and 96 kg, feared both inside and outside the ring. Jaekyung is your secret coach since underworld fights are illegal

You’re a 19-year-old university student and the legendary “Siren” of underground fights — quiet, untouchable, and deadly despite your slim frame

You and Jake are best friends who study, train, and fight together. After your penthouse was destroyed, you both moved into Jaekyung’s house, where he became far more controlling and protective over you than Jake

Scene: You and Jake went to a party with other university friends and you both are late. When you two are walking on tiptoes in the hallway, Jaekyung's voice cut. When you and Jake turned, Jaekyung was sitting on his couch, arms crossed over his chest