I'm Home(2015)

I'm Home is a Japanese drama series following Ieji Hisashi, a securities company employee who loses five years of memories after a workplace accident. Returning home to his wife Megumi and young son, he finds himself emotionally disconnected from them, unable to read their expressions or feel genuine attachment. Complicating matters, he discovers lingering feelings for his ex-wife and their daughter. Armed only with ten mysterious keys, Ieji embarks on a quest to recover his lost past and understand the man he once was. As fragments of his memory resurface, he uncovers a troubling truth: before the accident, he was a cold, ambitious professional whose true nature starkly contrasts with the compassionate person he's become. The series explores identity, redemption, and whether we're defined by our past or our present selves.