Because it is not hygienic.
When Eunji received the leadership of the Nam family, she had in her hands the personification of power and the ability of a family to do business and make money.
For her, that was the best thing that could happen at the moment.
Eunji watched Hyejin massaging her feet and smiled happily, that situation was the kind of situation she always dreamed of living.
After an exhausting day she gives her a good massage while she complains about her problems of the day.
"Yes, today we walk so much and talk to so many people... My feet are killing me."
Eunji pulled out a chair for her as well and without thinking too much put her girlfriend's feet on her lap and started a massage.
"Hmm... Then relax a bit, I'll give you a massage."
Hyejin smiled at the attitude, but it wasn't really necessary.
Let's take a shower and soak in warm water. "It is not necessary..."