Bubble Gum

We Are Not Who We Were Yesterday (1x4)

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Haeng A becomes fed up with being the least important part of Suk Joon’s life, and Ri Hwan becomes mad at his mother for not wanting Haeng A in his life anymore. As Yi Seul feels affectionate towards Ri Hwan, she also realizes that Haeng A must mean more than a sister to Ri Hwan.