自幼遭家人拋棄的 K (權相佑 飾)，一直把心靈自我封閉，直至遇上被車禍奪去至親的忌廉 (李寶英 飾)，二人像家人、又像朋友、更像戀人般相處，一切看來幸福無瑕，直到K的生命只剩下最後 200 日。

K 不忍心忌廉將要獨自生活，決定為她找個能託付終生的男人—朱煥，他與忌廉的感情迅速發展，很快就到了談婚論嫁的階段，所有事情都如願以償，但 K 的內心卻是無比的痛！

婚禮當天，K 領着忌廉的手，走上他們「最後」一段路，但原來三個人的心底，都分別埋藏着不可告人的秘密……

K and Cream first meet each other in high school. Both are orphans; Kay was abandoned by his parents who nevertheless left him a sizable sum of money, while Cream lost her entire family in a traffic accident. The two become soulmates and come to share a home, though Kay watches Cream switch from boyfriend to boyfriend as he keeps his own feelings for her to himself. Knowing that Cream's biggest fear is to be left alone, Kay keeps secret the fact that he has terminal cancer, and instead he urges her to marry a kind and healthy man. When Cream announces that she is in love with affluent doctor Joo-hwan, Kay is left heartbroken, but is satisfied that she has met her ideal partner. The audience later learns that Cream accidentally learns about K's illness while entering the hospital room K was at due to his fainting. It was shown earlier in the movie that Cream has asked K what his wish was; Cream finding a good and healthy man to spend her life with was what K wished for. Wanting to fulfill K's wish, Cream fakes falling in love with Joo-hwan. This part of the movie is shown at the end from Cream's perspective. Believing Cream has really found someone she loves, K asked Joo-hwan's fiance to break up with him. Joo-hwan's finace agrees under the condition that K lets her take photographs of him. The night before Joo-hwan and Cream's wedding, K found the courage to tell Cream that he loves her while Cream replies "me, too." In the end, K and Cream believe that they are married because they walked down the isle together when K is handing Cream off to Joo-hwan at their wedding.