On 9 September 2009, TV reporter YU CHOR-KIN received a message about the song "The One and Only" upon completion of her news coverage of a group wedding ceremony. At her friend's wedding banquet, CHOR-KIN got to meet CHEUNG YAT-HEI, who noticed CHOR-KIN had a stomachache and gave her a chocolate to help. While covering news of a four alarm fire, CHOR-KIN became an eye-witness to the life-and-death situation. Later on, when she was wandering near the sea shore, she encountered LOK TIN-SUNG, who also helped her. Time flies and now it's the year of 2013. CHOR-KIN and YAT-HEI have been in love with each other for four years. Due to his daughter YAU-YAU's bed-wetting problem, TIN-SUNG is late to send her to babysitter YU LO OI-LAM, who turns out to be CHOR-KIN's mother. Today CHOR-KIN becomes a Marketing Manager of a Chocolate chain store.… ...

TIN-SUNG's wife CHOI-YIN, an obstetrics and gynaecology doctor, didn't realize it's a special day for them until she calls her husband and daughter during her breaktime. At midnight, TIN-SUNG thinks of that fire broke out in 2009, whereas CHOR-KIN, after discovering that YAT-HEI doesn't take their anniversary seriously, also recalls the day when she came across TIN-SUNG four years ago. Bringing the matter up again, TIN-SUNG's supervisor JC tries to persuade him to accept the promotion, but TIN-SUNG turns him down because he wants to spend more time with his wife and daughter to take care of them. The first love of TIN-SUNG's elder sister, GOLDEN WONG, goes to TIN-SUNG's company, Warming Heart Furniture, to sell "Golden Water", yet none of TIN-SUNG's co-workers likes him. YAT-HEI sends a message to CHOR-KIN, lying that he has returned home to rest. In fact, he goes to hang out with his partners in a bar.… ...

All her female colleagues ask CHOR-KIN about the new appointed Marketing Director, and they are very excited after learning that their new boss is male. New trainee JIAO FEI, who comes from Guangzhou, goes to CHOR-KIN to report for duty, but LAU-KUEN behaves in a very unfriendly way towards her. GOLDEN yells towards his new next-door neighbour's front door because his door is blocked by his new neighbour's shoe closet again. To his surprise, the one who opens the door turns out to be JIAO FEI. JIAO FEI uses a cup noodle as her birthday cake, making a wish that she must marry a wealthy guy before her 25th birthday. With TIN-SUNG and CHOI YIN going to OI-LAM's home to pick up YAU-YAU, neither CHOR-KIN nor TIN-SUNG can recognize each other although they met one another before.… ...

CHOR-KIN recalls that she and YAT-HEI have been unable to make their Tokyo trip due to various things ever since they started dating each other in 2009, so she cannot help thinking that their best times might have gone forever. On his way to buy some materials to make a lantern, TIN-SUNG reflects on those days when he and CHOI YIN encountered. TIN-SUNG is making the lantern together with his daughter YAU-YAU, who wants to know what kind of colour CHOR-KIN likes. So OI-LAM gives her daughter CHOR-KIN's mobile phone number to TIN-SUNG, letting YAU-YAU call CHOR-KIN and ask her directly. Making an appointment with YAT-HEI to have a Japanese buffet together with her family members at Saturday, CHOR-KIN asks her boyfriend YAT-HEI when they can set out for a trip to Tokyo, but YAT-HEI puts her off with excuses. GOLDEN bumps into JIAO FEI again when walking out of his home, and still has a bad impression to her.… ...

While patrolling at night, security guard CHIU-WING sees that CHOR-KIN is still in her office. Upon CHOR-KIN's return in the next day morning, OI-LAM asks her to look after YAU-YAU for her during the day. CHOI-YIN makes an appointment to have a full body check-up at the hospital, worrying that she might not be able to accompany her husband and daughter to Finland. TIN-SUNG wants to let YAU-YAU sleep over at OI-LAM’s home so that he can go back to the hospital to accompany his wife, and CHOR-KIN agrees. On the first day when the new Marketing Director WONG CHI-TSEUNG reports for duty, all the female co-workers ask CHIU-WING what CHI-TSEUNG looks like. As soon as JIAO FEI hears the others calling CHI-TSEUNG “PRINCE EDWARD”, she requests the Human Resources Department to change her name board to “DIANA”.… ...