In my perspective, I think even before Jin-Ah unconsciously liked Jina. (That subtle hint that she is curious and wanted to hear more about Jina and she was focused on Jina she couldn't remembe anything else). Even though she tries to rationalize her actions, her jealousy and constant thoughts about Heo Jina betray her. She oscillates between wanting distance and craving closeness. While Heo Jina consciously resists, but her actions show she hasn’t let go either.
In my perspective, I think even before Jin-Ah unconsciously liked Jina. (That subtle hint that she is curious and wanted to hear more about Jina and she was focused on Jina she couldn't remembe anything else). Even though she tries to rationalize her actions, her jealousy and constant thoughts about Heo Jina betray her. She oscillates between wanting distance and craving closeness. While Heo Jina consciously resists, but her actions show she hasn’t let go either.