Personal Taste (2010)

It has most of the same comedy vibe. In one they're pretending to be a couple, in the other one, one of them pretends he is gay.

It's just striking me that in both dramas, the main lead is hidingg his true identity, in order to get closer to the female lead, and get something from her, but he eventually falls in love with her...

Here the plot is a love story developing from a business deal which is much finely pictured here.. Also the love which develop is so amazing to watch...Go for it

Maria, struggling financially, juggles a low-paying day job with nighttime shifts at a cabaret to fund her sister Nana's eye operation. Tragedy struck their family when a young Maria accidentally caused a fire, resulting in Nana's blindness and their father's death. Shiro, a discontented concert pianist, crosses paths with Maria in a traffic accident, leading to his hospitalization. Adopting a false identity and amnesia, Shiro seeks refuge at Maria's home, eventually becoming a cabaret pianist. Unbeknownst to them, fate weaves a complex web, revealing that their lives were never meant to intersect.

Both dramas are about a man and a woman living together and navigating the relationship that forms from proximity. I prefer Because this is My First Life, but Personal Taste is worth watching