志明与春娇在一起后，热烈的恋情慢慢趋于平淡。两人就这么慢慢不再联系，没有大吵大闹，没有明确表明，不知不觉间两人就自然分手了。此后，志明前往北京发展。在北京他结识了美丽知性的空姐尚优优，尚优优有着北京女孩的大方、活泼和宽容，志明跟她在一起总能心情愉悦，很快志明便投入到新的恋情。此时还在香港的春娇继续经营化妆品店，可市场空间有限，她的店出现经营危机。春娇经过深思熟虑后决定关掉化妆品品牌香港分店，她和娥姐准备转战到市场空间更大的内地北京。春娇来到北京不久意外邂逅志明，这对昔日恋人再见面有些尴尬和不自然。两人都以为已经放下彼此，却不料再次重逢后那种几乎已经忘却的激情再次萌发。志明身边已有温柔美丽的优优相伴，春娇也跟体贴稳重的成功男士SAM生出暧昧感情，但他们两人都仿佛中了蛊毒一般不可遏制地想偷偷见面。于是两人不约而同地瞒着另一半，再见时他们也小心翼翼地保持距离，仿佛这是他们心底最后的防线，不能逾越也不敢逾越。两人的感情该如何收场…

After Zhiming and Chunjiao got together, their passionate relationship gradually became dull. The two of them stopped contacting each other slowly, without arguing or making it clear, they broke up naturally before they knew it. After that, Zhiming went to Beijing to develop. In Beijing, he met Shang Youyou, a beautiful and intelligent stewardess. Shang Youyou has the generosity, liveliness and tolerance of a Beijing girl. Zhiming always feels happy when he is with her, and soon Zhiming falls into a new relationship. At this time, Chunjiao, who was still in Hong Kong, continued to operate a cosmetics store, but the market space was limited, and her store was in crisis. After careful consideration, Chunjiao decided to close the Hong Kong branch of the cosmetics brand. She and Sister E are going to move to Beijing in the Mainland where the market space is larger. Not long after Chunjiao came to Beijing, she accidentally ran into Zhiming. It was awkward and unnatural for the former lovers to meet again. Both of them thought that they had let go of each other, but unexpectedly after meeting again, the almost forgotten passion sprouted again. Zhiming is accompanied by the gentle and beautiful Youyou, and Chunjiao also develops an ambiguous relationship with the considerate and steady successful man SAM, but both of them want to meet secretly as if they have been poisoned. So the two coincidentally kept the secret from the other half, and when they saw each other, they also carefully kept a distance, as if this was the last line of defense in their hearts, which they could not cross and did not dare to cross. How should the relationship between the two end..