The Ending Of The Glory Season 1, Part 1 Explained

"The Glory" takes its time to create a complex villain. 

Villains work for a variety of reasons; sometimes the less the audience knows about their background, the better, and other times their past helps the audience understand their motivations. Yeon-Jin's past isn't particularly rich in expository information, but her strained relationship with her mother is undoubtedly a clue. For all her might, in every scene Yeon-Jin shares with her mother, she just ends up shrinking in comparison.

Yeon-Jin attempts to project the relationship she has with her mother onto everyone else, making sure to degrade them in the same way that her mother does to her. However, as an adult, she now has her own family, exactly as she had always wished for, and she wishes to put all of the pain and devastation she created behind her. Dong-Eun's reappearance in her life complicates that objective, especially now that Dong-Eun appears to be successful in finding ways to ruin her life.

Given all she's been through, viewers are almost certainly on Dong-Eun's side. However, it is also evident that Yeon-Jin is no longer passively waiting to be destroyed. She decides to do her investigation. Locating Dong-Eun's residence, tracking her mother, and even having her thugs follow Dong-Eun around town. The dynamic between the two adversaries points towards a thrilling final showdown.