Private investigator, Chu Cho On/Joe (Kenneth Ma) goes through an overlap connecting four different love stories in the four seasons of spring, summer, autumn and winter. Each story is unique and features different emotions that echoes the different seasons as well as the different take on a love relationship. In the four seasons, love is not as simple as it appears.
Episodes 1-5: Spring
Lam Chun Fan (Toby Leung) is a middle-aged woman who has never been on a date before. By chance lands herself a job as a chauffeur and assistant for popular idol singer Season/Si San (Him Law). Her first impression of him leaves him in her bad books as she sees him as a flirtatious playboy that the tabloids claim him to be.
Meanwhile, her younger sister Lam Chun Fong (Kandy Wong), is a high school student with cerebellar hemangioblastoma, who has a huge girl crush on Season. As she gets to personally know Season, she sees resemblance between him and her long gone father more than just an idol.
As Chun Fan and Season spend more time together she began to realise his inner world and underlying nature as a sincere but lonely young man.
They fall for each other and start an underground relationship but Chun Fan soon discovers that everything that has happened between her and Si San was arranged by his manager, Colleen (Jess Shum).
Will Chun Fan’s first love be her last or will it come to an end?
Episodes 6-10: Summer
Ha Chi Yan/Summer (Kate Tsui) is a comprehensive television producer. However, her latest female-orientated variety program receives negative feedback from the audience. In order to rebuild her former momentum, she has no choice but to star in her new television dating game show which is based on choosing a suitable husband among a batch of bachelors.
There she meets her the show’s director and ex-boyfriend, Ng Chun Kai (Ron Ng). They were primary and high school sweethearts but he could never muster the courage and tell her that Summer that he loves her. This lead to them distancing from each other and eventually drifting apart but but he had no choice and could not tell her the truth. So she decides to use this opportunity to exact “vengeance” on him but the show gets her entangled between four males and realises her heart for Chun Kai has never changed.
But has Chun Kai’s heart changed? Will these former lovers be able to rekindle a former burning flame? Who will become Chi Yan’s Mr. Right at the end of all this?
Episodes 11-15: Autumn
It that hair stylist Ho Chau Sang/Kim (Nancy Wu) works in the same building as barrister Fung Sau Man/Simon (Vincent Wong) which leads them to fall in love with each other. However, it is also fate that tears the couple apart due to a small accident that separated them on a near first date.
Due to her loss, Chau Sang blindly accepts a proposal from fellow hairstylist Fang Ka Wai/Ray (Oscar Leung). It was only after marriage that the two discover how incompatible that they are with each other. They would constantly bicker due to their differences in their lifestyle, especially with her mother-in-law in town. She even suspects that he may be committing an extramarital affair.
Chau Sing realises that the clock is ticking away so on a whim, she returns back to where she first met Sau Man to begin her second life.
Will it be second time lucky or unlucky for Chau Sing? Where will she end up at the end of this?
Episodes 16-20: Winter
By request, Yiu Tung Nei (Myolie Wu) meets Joe when she asks him to research the origins of an old receipt to help her piece together her missing memories.
During the investigation, Joe discovers that Tung Nei’s brain often has scattered images and broken recollections of her past with a man as well as her numerous phobias. So he decides to dig deeper and realises that she has been though serious traumas due to this man, and this could very well be the reason behind her memory loss.
Joe works tremendously hard helping her fit the puzzles together but this leads to misunderstandings between him and Tung Nei, as well as him coming upon a surprise in his own life.
What will this surprise be? Will Tung Nei’s traumatic past be found? Where will this lead the couple?