NOTE: Manwha is the Korean term for the word "manga".
I rarely read manga because of several reasons: I enjoy the TV series after them more, or they just don't have a nice art to look at. Seriously, some stories are better off as written books.
However, "Nineteen, Twenty-one" has managed to enrapture me. The art is gorgeous, the story is so catchy, I love the character development too! Also, it's only got 21 chapters, so you could read it all pretty fast.
This Manwha is a charming story about two young adults, a 19 year old guy and a 21 year-old girl, who start off by being complete opposites, but are united by their love for cats. They both evolve, learning frim each-other and about the rules of the world that surrounds them and the cats they love to take care of.