It is a 2015 Japanese series. Directed by Yoshihiro Fukagawa, Ken Higurashi, Akinori Ito. It is written by Kazuhiko Yukawa. It stars Yuki Amami, Ikki Sawamura, Yoji Tanaka with others.
Hiro Kamon works as a librarian. She ignores the outside world & only loves books. She holds a fake smile but curses at people around her. One day, she meets her ex-boyfriend Choji Himura again. He works as a deputy director at a kinder garden.
25 years ago, he suddenly disappeared & their relationship ended just like that. Hiro is still unsure why he dumped her. She decides to ask him why he left her. He tells her he is gay & asks her to marry him.
Shocked she wants to refuse. But he asks her to have a fake marriage with him. His mother has cancer & they have to have this fake marriage till she is alive.
The leads are wonderful. With their back stories it would be interesting.
Asian Entertainment 