These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Les Yay: In chapter 46, in retaliation to Si-Hoo's bullying, Soo-ri grabs Ma-ri's hand.
Yoo Chae Rin constantly stalks Ma Ri, holding her hand and calling her pretty. At the end of chapter 77 she asks if she can go to her house and meet her parents. Of course she seems to be something of a vampophile but gender doesn't seem to be an issue.
The next chapter has her rub oil on Ma Ri's face while dressed in nothing but a towel and compliment how smooth her skin is. Then they get in bed together.
Tearjerker: Chapter 28 and 29. Ma-ri's struggles are so heart-breaking...