在这部姐姐剧情片中,童年时代，一场凶猛的洪水让年幼的允熙（成宥利 饰）体会到了死神擦肩而过的恐怖滋味，所幸允熙得到了弟弟的救助才得以保住性命，但是弟弟却在洪水中失去了年轻的生命。这一段灰暗而伤痛的回忆一直折磨着允熙，甚至在成年之后，允熙依然保留着下雨天绝不出门的习惯，她的生活也因此而陷入了困境之中。
一次偶然中，一个名叫镇浩（李柱胜 饰）的不良少年抢走了允熙的钱包，而在钱包里，留有允熙关于弟弟唯一也是最后的回忆。之后，允熙再度和镇浩相遇了，在镇浩的身上，她看到了自己的影子，面对同样承受着痛苦的镇浩，允熙决定迈出勇敢的一步。
Yoon-Hee (Sung Yu-Ri) carries the heavy burden of having lost her younger brother in a traumatic incident as a young child. Her younger brother died after saving her from a rising river caused by heavy rains. Because of that incident, Yoon-Hee can't go out during the rainy season and she has been fired from numerous jobs due to this. One day, Yoon-Hee's wallet is stolen by teenager Jin-Ho (Lee Ju-Seung) in their neighborhood. In the wallet, there's only a picture of her younger brother. Yoon-Hee begins a new job as a cafeteria worker at a high school. While working in the cafeteria, Yoon-Hee meets Jin-Ho, the teen who stole her wallet. They both realize that they carry similar emotional scars from past incidents. In order to save Jin-Ho, Yoon-Hee attempts to break free from her own trauma.
天总会亮的。关于我们的姐姐。“弟弟：记得在这杂乱的生活里，每天带点笑意” ——《姐姐》。遇见姐姐。很走心的电影。天国。善良而卑微的人生也还是会照进阳光。天国。影评不多。谁能体谅我有雨天。
