Spoiler: KimJi plot I came up with while stuck in (HEAVY) traffic on the way to work hahahaha Kim's character would wake up with amnesia (after a car accident) in a foreign country and she will be distraught but James Ji's character would come for her. JJ will say they are married and that she was on vacation and got into an accident so he came for her to bring her home. Somehow Kim is suspicious (she has amnesia) so she remains distant with JJ. He says in order for her to recuperate well, they will go home to the province instead if Bangkok. Out of consideration for Kim, JJ says they can "start over again" and be friends first and not be intimate as husband and wife.
So Kim remains wary of JJ's character but he acts sweet and caring, etc. But somehow something really does not feel right. She cannot understand why she keeps on thinking that JJ is hiding something from her so he is suspicious and she pushes him away. But he would always be nice and understanding and her heart melts little by little.
JJ would remind her of another guy sometimes. One day JJ is having a horrible day and accidentally makes the p'ek moves on Kim (i.e. he goes on angry pervert mode) and she suddenly has a flashback of another man and she realizes that she probably cheated on him and actually had a rendezvous with another guy abroad. Guilty, she makes amends and becomes sweet on him. The two of them are happy.
Though they are happy, questions still nag Kim about her accident, and also there is still something suspicious about JJ. One day she gets a call from the N'Rai and she learns that her husband had an affair with a woman abroad. She investigates some more and remembers things about herself and her husband and realizes he did live a double life and is actually s jerk. Angry and heartbroken, she fights JJ and leaves for Bangkok.
At Bangkok, she gets more clues about her life and about her husband but something does not click. JJ ultimately comes back for her in BKK but she rejects him until one day she almost gets a panic attack as something from the time of her accident is recreated (like.... I dunno, there is a hardcore typhoon in BKK with lighting and thunder and everything the same scenario happened when she had an accident) but JJ comes to her rescue so they reconcile. But while they are reconciling, JJ gets sick and in the middle of hid delirium, he talks strange like he's another person and begging Kim to love him.
So FINALLY (i swear this is it you guys) the insurance company calls up Kim and revesls everything. That she was married to another guy and he had died. Frantic, Kim looks at her wedding photos and sees JJ..... As the best man in her wedding.
It turns out JJ is actually her brother in law. JJ explains back then he had to pretend to be her fiance/husband so he can easily bring her home to Thailand but things got out of hand, especially considering he had loved her since forever. Since she was so vulnerable and heart broken (JJ thought the love of her life, his bro, died and he thought it would kill her) he figured he'd stand in for his bro to make things lighter in her heart somewhat.
It is then revealed that JJ would always be under his perfect brother's shadow, like the older brother would have everything, including the best woman on earth, Kim. Kim is the only one who has been genuinely nice to him but unfortunately, she falls for his perfect brother so he didn't even try to get her. So when he gets a chance, he grabs it without thinking, after he realizes that it's his only chance to get her love and he knew she would remember eventually and hate him forever. His brother is the sun, and he has just always been the shadow, in the dark, behind Kim but always quietly behind her wherever she goes.
When Kim learns about JJ's lie, she gets angry BUT she finally remembers the night of the accident. It turns out she discovers older brother is actually evil and a jerk and has another woman. He runs off with the woman and Kim runs after them. They get into an accident first, and Kim, since she is a good person, tried to rescue them despite her heartbreak but then she hits her head and gets amnesia but before she lost consciousness, she prayed to forget everything and get the love she deserved.
And it turns out it's JJ, the cute brother in law who had always been so nice to her but never showed any romantic interest.
So in the end, they reconcile and make babies. The end.