In "Undercover High School," Seo Gang-jun realized that Jin Gi-joo is his first love.

In the MBC Friday-Saturday drama "Undercover High School," which aired on the 14th, Jung Hae-sung (played by Seo Gang-jun) was depicted discovering that Oh Soo-ah (played by Jin Gi-joo) is his first love.

On that day, upon hearing "O Bong-ja," Jung Hae-sung realized that his first love from the past was indeed Oh Soo-ah. Jung Hae-sung asked, "Is it Bong-ja? Is that your name? O Bong-ja?" and Oh Soo-ah responded, "Yes, that's my name originally... But why are you laughing at someone else's name?"

Jung Hae-sung attempted to explain, but Oh Soo-ah, feeling offended, interrupted and said, "It's rude to laugh like that in front of me. I was going to take you home, but I can't do that. You can go alone," and she left. Looking at her retreating figure, Jung Hae-sung smiled and returned home, recalling memories by looking at a photo he took with Oh Soo-ah during their childhood.

The next day, Jung Hae-sung arrived at school early and asked Oh Soo-ah, who was dancing while cleaning, "What are you doing so early in the morning?" Oh Soo-ah replied that she was cleaning for the homeroom teacher, to which Jung Hae-sung responded, "That's impressive. You will definitely become a homeroom teacher," encouraging her. Later, Oh Soo-ah felt confused by the drastically changed behavior of Jung Hae-sung.

[Photo] Captured from the broadcast of "Undercover High School"

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