Ipsae's Leaf In Haneum's Breeze summary:

[Translated by Mosh Scans]Seol Ipsae, who is as light as a fluttering leaf, lives his life with the motto of pleasure and ease. Suddenly, an engineering nerd named Jeong Haneum falls right into his life.Thinking 'He's such a total nerd', he found out that the guy was perfect in every way. His personality, looks, physique... and most importantly, even his XX...!!!