Thank You

Doctor Min Gi-seo (Jang Hyuk) is a surgeon whose wealthy background and superior talent causes him to be arrogant and curt with others. But when his girlfriend Ji-min (Choi Kang-hee) dies of cancer after he failed to save her on the operating table, he is haunted by her confession that she had unwittingly given a young girl HIV via a contaminated blood transfusion when she was a medical intern years ago and never owned up to her mistake. Grieving and needing to make amends on Ji-min's behalf, Gi-seo searches for the child Bom (Korean for "spring"), and finds her living on Pureun-do ("Blue Island"). The precocious eight-year-old Bom (Seo Shin-ae) is innocently unaware of her condition, and she lives happily with her mother Young-shin (Gong Hyo-jin), and her great-grandfather Mr. Lee (Shin Goo) who's always wandering off and loves choco pie. Ever since Bom's diagnosis, Young-shin has worked hard to care for her daughter and senile grandfather, keeping a strong face and cheery front despite their poor circumstances and the difficulties of being a single mother. Young-shin has always been mum about Bom's paternity, but in the small community of Pureun-do, rumors are rife that the father is Choi Seok-hyun (Shin Sung-rok), son of the richest woman (Kang Boo-ja) in town. Seok-hyun currently resides in Seoul with his fiancée (Kim Sung-eun), until work-related matters take him back to the island for the first time in a decade. Upon seeing Young-shin again, Seok-hyun had no idea that she'd had a child, and doesn't believe her assertions that Bom isn't his. As their paths continue to cross, he becomes jealous of Gi-seo and realizes that he isn't quite over her. Meanwhile, to keep an eye on Bom, Gi-seo decides to rent a room at Young-shin's house. At first he mocks the seemingly backward, rural day-to-day life on Pureun-do, but as he observes the Lee family and their constant kindness and selflessness at close quarters, Gi-seo finds himself slowly changing and falling in love with Young-shin. But when the townspeople later learn that Bom has HIV, they must all deal with the fear and discrimination that follows.