陳天美（鄭秀文）和何彬（陸駿光）透過莫姑娘（談善言）申請成為寄養家庭，夫婦倆很用心，迎來各有問題的小孩在他們人生不同階段出現——因母親毒癮而缺乏照顧的文森（黃梓樂）、父母離異被當人球的小菁（李昀蔚）、患有兔唇遭嫌棄的小花（吳祉嶠）、苦苦等待一個家的阿明（趙啓嵐）、與及對成年人失去信任的家希（曾睿彤）家朗（徐嘉謙）姊弟。天美在小孩身上看到了父母、同學、社會造成的傷痕，她用盡方法讓眾人重拾希望，成為大家依靠、好好相處的家人。

別人都讚天美偉大，但她知道，是這班孩子拯救了她。因為一直無法磨滅喪兒傷痛的天美，直到遇上寄養孩子後，她早已掏空了的心才有所寄託，重拾做母親的感覺；本來有缺陷之家，也暫時得到填補。

父母養育孩子，其實很多時候，是孩子拯救了父母。

十三年間，天美醉心於照顧小孩，永遠都一意孤行。何彬出軌，終於讓她聽見埋藏在對方內心的說話，當下天美才意識到自己忽略對方的感受，忘卻了孩子真正需要。往後的日子，儘管何彬努力補救，天美仍遲遲未能確定自己心意。最終靠著寄養小孩有意無意的啟發，才幫助他們挽回這段關係。

正當夫婦與快將升上大學的寄養孩子仲恆（劉朝健）過著簡單快樂的時光，卻迎來一場突變；流水運送落花，人生的旅程還是會延續下去，勾起淡淡思念。

Parenting means raising and nurturing children, but oftentimes children enrich and enlighten the lives of parents instead.

Chan Tin Mei and Ho Bun’s son passed away abruptly at three years old due to a congenital heart disease. Still in pain over the loss, Mei resists having another child.

One day, Mei finds out that they can become a foster family. Her desolate heart finds sustenance from possibly regaining the feeling of being a mother. But when she discovers the emotional scars on the children caused by their harsh realities, she starts to adjust her expectations.

Bun’s extramarital affair leads to a big fight between the couple, but it also reveals the feelings concealed in Bun’s heart. Mei realizes her selfishness; she has neglected Bun’s feelings and the true needs of her wards. In the end, the foster children inspire her and help the couple to redeem their relationship. Although Mei is praised for her dedication to her foster children, she knows she has been saved by the children instead.

When the couple finally settles into a simple and happy life with their foster child, Mei suffers a heart attack. In the final stage of her life, Mei’s seven foster children reappear. She seems to see her son grow in these foster children.

《流水落花》正式官方預告 | Lost Love - Official Trailer - YouTube