The Quiet Life of a Professor and His Butler(2012)

Kyouju to Shitsuji no Shizuka na Seikatsu

"My young butler doesn't show much emotion. He sometimes lets his guard down, and shows a vulnerable side that just confuses me..." Sogo Shiba is a university professor who hates being managed and controlled. The house that his brother gave him in his will came with a young and beautiful butler. At first, Sogo is annoyed with the always serious Haruki, but when he happens to see him smiling, he feels something in his heart...

(Source: Renta!)