In the fourth episode of Love Supremacy Zone, titled "A Triangle of Love,"
the relationship between Tae-myung-ha and Cha Yeo-woon continues to blossom,
despite the looming threat of Tae-myung-ha's return to his own reality. Their
bond deepens as they share a lighthearted and enjoyable date at an amusement
park, where Tae-myung-ha's genuine affection shines through as he wins Yeo-woon
a stuffed animal.

Meanwhile, Cheon Sang-won's jealousy intensifies as he witnesses the growing connection between Tae-myung-ha and Yeo-woon. Consumed by envy, he resorts to underhanded tactics, attempting to disrupt their relationship by spreading lies about Tae-myung-ha's true identity. However, Yeo-woon's unwavering trust in Tae-myung-ha proves unshakeable, and she confronts Sang-won, exposing his deceitful nature.
Amidst the romantic entanglements, Tae-myung-ha makes a significant stride towards his goal of returning home. He uncovers the existence of a crucial item, the "Love Key," which holds the power to open a portal back to his world. However, the quest for the Love Key proves daunting, as its whereabouts remain shrouded in mystery within the vast expanse of the game world.
As the episode draws to a close, Tae-myung-ha's determination to reunite with his own life intensifies, while the love triangle between the three characters reaches a boiling point. The remaining episodes promise to reveal the fate of their relationships and the outcome of Tae-myung-ha's quest for the elusive Love Key.