Big
빅 (original)
18-year-old Kang Gyung-Joon's spirit suddenly becomes transplanted in the body of 30-year-old Seo Yoon Jae. Seo-Yon-Jae is a successful doctor and engaged to high school teacher Gil Da-Ran. Gil Da-Ran just so happens to be the teacher of 18-year old Kang Gyung-Joon. More problems ensue when 30-year-old Seo Yoon Jae falls in love with another woman.
Starring Gong Yoo, Lee Min-jung, Bae Suzy, Jang Hee-jin, Shin Won-ho, Jang Hyun-sung, Koh Soo-hee, Im Ji-eun, Ahn Suk-hwan, Baek Sung-hyun
It's a drama and comedy show, and has a rating of 6.9 out of 10 from Imdb which is usually fine for this kind of show.
Watch it here
Not found streaming from United Kingdom.