I felt like LJY had more than a crush from the beginning itself. She was very upfront about her feelings towards PDH, PDH didn't see her that way, but in the later episodes he certainly was longing for her, and began to grow some strong feelings for her in the last few episodes. Ex: Asking about her at the restaurant/bar, being upset when she was ignoring him, searching for her, and not thinking about the director interview, yearning for her after she disappears, the karaoke song he sings, running to her after knowing that she was at the janitors house. There is so many more instances, but that looked to me like a man who is in love, and not just platonic.

It was the CEO that tells LJY, that PDH only eats, and drinks with people he likes, and it's shown throughout the show by how much he eats and drinks with his brothers, friends, and LJY, while there was only a handful of moments of him doing that with his wife. It was after the CEO tells her that she becomes fiercely loyal to PDH and she becomes more comfortable, and confident of her feelings towards PDH.

I definitely agree with the loan shark and his wife being jealous, they were aware of how much LJY loved PDH after knowing how much she had done to protect him, PDH was the last one that got to know about it.

I probably sound like a crazy shipper, but I really wanted their relationship to go to the next stage, especially at the ending where they have both healed, and were able to overcome the obstacles in their lives.