该剧讲述主人公因一封信触发命运交叠，逐步揭晓往事悬念的情感故事。一个邮筒、一封信，促成跨时空的命运联动，也唤起时空两端的情感交响。随着跨越时空的十二封通信，一群人爱情、友情与亲情交织的过往被揭开，命运悬念走向明朗的同时，也完成了对于主人公们的情感救赎。该剧以奇幻设定做壳，以命运悬念为饵，以细腻情感成核，层次饱满，以信件作为传递情感与爱的载体，讲述跨越时空的动人故事。

When high school teacher Na Aejoon shows up for work on an ordinary day, he never expects to bump into his favorite celebrity in the hallway. But when his school becomes a filming location for a show starring Choi Siyeol, his bias from the idol group A-One, that's exactly what happens! If that's not enough to give a fanboy a heart attack, Siyeol takes an interest in Aejoon and asks him to join the show as his "co-teacher." Desperate to keep his fan life a secret, Aejoon is forced to put his acting skills to the test, and not just on camera. But as he spends more and more time with Siyeol, the deception becomes harder to keep up. Not to mention, he might not be the only one keeping secrets…

This is an English-language contemporary adaptation of French writer Françoise Sagan’s classic novel Bonjour Tristesse. The story follows Cécile (McInerny), a young woman spending the summer in a villa in the south of France with her widowed father Raymond (Bang) and his latest love interest, Elsa (Harzoune). Theirs is a lived-in compatibility—a world of ease and languor. But all that soon changes with the arrival of Anne (Sevigny), an old friend of Raymond and Cécile’s mother. Anne’s presence and deep connection to the past alters the villa’s mood. While her way of life appears mismatched with theirs, an attraction—years in the making—forms. Desperate to regain control, Cécile sets in motion a plan to drive Anne away with tragic consequences.

马克斯是一个陷入困境的人，他开始在一家养老院工作，并意识到那里的居民和看护人隐藏着险恶的秘密。当他调查这座建筑及其被禁止的四楼时，他开始发现自己的过去和作为寄养儿童的成长经历有密切的关系。

张六六重生在母亲抉择是否回城的当天。上一世家中的悲剧历历在目，为了避免悲剧重演，她决心主动帮母亲顺利回城。后来政策松动，张六六一家得以在城里团聚。最终，张六六在幸福的家庭中长大，学业上也取得了优异成绩。

船王家患了离魂症的小少爷此时命悬一线，小多鱼被战家三姨太带回家后，只是轻轻在人脸上啃了一口，小少爷就醒了！不仅如此，自从小多鱼来到战家，瘫痪多年的老夫人站了起来，被人暗算的战爷次次逢凶化吉，中毒身弱的六夫人不药自愈又怀上了双胞胎。改自番茄小说《港城冲喜来了个小财神》，作者楮君。

陶禾衣为学玉雕嫁给病弱的李齐光冲喜，李齐光好友赵霁云对她一见钟情，经诸多波折与算计后，陶禾衣终于和李齐光和离，搬入赵府，在朝夕相处下陶禾衣与赵霁云的感情逐渐升温，陶禾衣却发现了和李齐光和离的真相。

苏意穿书成炮灰女配，遭未婚夫与小白莲羞辱，当场反击退婚。她想奋斗挣钱、虐渣吃瓜，却不知心声被腹黑男周靳川听见，自己卖了自己还帮数钱。坚定无神论者的周靳川，因她开始动摇。