[Spoiler] "Take Care of Us, Captain" Ji Jin-hee can't stand Ryu Sang-wook and his attraction to Koo Hye-sun

On "Take Care of Us, Captain", Yoon-seong (Ji Jin-hee) couldn't hide his discomfort.

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Yoon-seong couldn't hide his jealousy at Jong-il (Ryu Sang-wook) who was enthusiastically expressing his interest in Da-jin (Koo Hye-sun).

Yoon-seong went out to lecture some university students in the Flights and Aviation department with Da-jin. A student in the class asked her personal questions like, "Are you married?", "When was your first kiss?" and more, showing his interest in her.

As that student didn't pay attention to Yoon-seong's lecture and stared only at Da-jin, Yoon-seong became annoyed.

The student grabbed Da-jin by the wrist and dragged her out of campus the moment the lecture was over and when she returned after having gotten rid of him, Yoon-seong also followed her around.

The student gave her a note and Yoon-seong cut it off from the middle and crumpled it up, not being able to hide his jealousy.

Meanwhile, while Jong-il (Ryu Sang-wook) drew interest with his performance of being in love with Da-jin, the drama hinted that there was going to be competition with Yoon-seong for her later on.