My Fiction Japanese Drama Episode 4

Igawa Masaki is an ordinary man living in a peaceful town that has zero incidents and has achieved 1,100 consecutive days of safety. With his calm personality, he works as a caregiver at a nursing home and lives a happy life with his wife, Mayumi, whom he has been married to for the past six years.One day, Masaki suffers a fall and falls into a coma. When he wakes up a week later, Masaki finds a stranger living in his home, impersonating him. His colleagues, neighbors, and even Mayumi seem to have no memory of him. While Masaki's life turns upside down, he finds out a "shocking truth" that lies behind all these events.(Source: DramaWiki)