You don't have to wait for Yumi's cell 3...it's webtoon original version is available on webtoon.

Yumi's cell is about how a young lady navigates thorough her life with the help of her cells(depicted as small cartoon type characters). It shows some psychological aspects of all the main leads and their dating styles, specifically.

The K-drama has been released as season 1 and season 2. You can watch them and if you're curious about what happens next, webtoon version is available!