I won't say both dramas are similar bcoz this is more on comedy side. This is "an intriguing story" of finding the real dad.

Leads meets in a hospital due to their incurable illness and decides to spend their remaining time together.

Both are gender-blender.
FL pretends to be her brother.
ML is a tsundere.
ML is a singer/guitarist in a band.

This web-series is nothing like 'Coffee Prince' at all. Only similarity is that ML mistook the FL as a guy and started to fall for him(her).

FL introduce herself as a guy to ML because of some situation.
ML starts liking FL but thinks that she is a guy.
Series is short but sweet.