Plot Speedrun Summary

A remind for you forgetfuls of what we know thus far.

Character Summary:
Zeo - ML. Adopted son of Chairman Hyeon. Director, later President of Songyeon.
Rawon - MC. Employee of Songyeon Hotel&Resorts. Snarky but pragmatic.
Jiwon - MC's troublemaking brother and Editor K of Royal Style (magazine). On a vigilante revenge quest.
Kang Sejeong - daughter of Chairman Kang, and owner of Royal Style. Has a secret partnership with Zeo, and is a backer for Editor K.
Geonhyeong - Sejeong's deceased boyfriend/bodyguard.
Seongyu - Jiwon's deceased ex-lover, and Julia Kim's illegitimate son.
Julia Kim - Sejeong's and Seongyu's mother/wife of Royal Groups Chairman Kang. Gossip provider for Editor K.
Mr Joo - Rawon's shitty boss  
Ms Nahyeon - Rawon's shitty ex-girlfriend
Ms Cha - Zeo's secretary
Hyeon Hakjoon - Chairman of Hyeon Corp. Zeo's adoptive father.
Hyeon Eunjo - Hakjoon's daughter. Zeo's sister (unsure if blood related or not). Warns Zeo not to hold onto important things (Rawon), as her ex-husband was ruined by their own father.
Chairman Kang - owner of Royal Group. Alleged killer of both Seongyu and Geonhyeong.

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Story Summary:
Zeo while keeping tabs on Editor K, runs into Rawon (his employee) and Jiwon at a gay bar, and forms an interest in Rawon, whom he later assigns to the Jeju Resort project. They become closer over the duration of the project. Though, Rawon has no idea his brother Jiwon is Editor K.

Editor K is an infamous writer for the magazine Royal Style, owned by Kang Sejeong (the heiress to Royal Group), which spills dirty secrets on the rich. Few know who he is or how he gets his information.

Zeo is forced by his adoptive father (Chairman Hyeon) to marry Kang Sejeong so they can acquire Royal Style (the aforementioned gossip mag), and consequently: Editor K. But unbeknownst to everyone, Zeo already has a secret cooperation with Sejeong to overthrow each other's respective companies. Simply put: Zeo wants to overtake Chairman Hyeon, and Sejeong wants to destroy Chairman Kang.

During the resort project, Rawon finds out about Sejeong's secret relationship with her bodyguard, Geonheyong, despite being Zeo's alleged fiancee. She's even pregnant. Amidst the awkwardness, he still helps plan Zeo and Sejeong's fake wedding much to his chagrin, only to find that Zeo has purposely bailed, leaving one furious CEO father. Rawon catches a fist for Sejeong from Chairman Kang; to which later Zeo found out about...and the problem was *ahem* dealt with in an appropriate manner by sources unknown.

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Fast forward to the current events:
Geonhyeong is suddenly dead; supposedly run over by a truck, in the same manner Seongyu was killed. Sejeong is in mourning. She knows he was killed in the same way her (half?)brother(?) Seongyu was: by the alleged hands her own father.

Rawon has trouble keeping contact with Zeo because of how busy he is during the aftermath, but doesn't remember their drunken tryst. Meanwhile Mrs. Cha warns Zeo that Rawon might get dragged into the crossfire between the two groups.

Jiwon is writing a detailed corruption report on Zeo. He is willing to work for Kang's mother-daughter pair Sejeong and Julia Kim in hopes of taking down Chairman Kang, as revenge for his deceased lover, Seongyu. He has a grudge against the rich and wants to follow in the footsteps of Seongyu's vigilante paparazzi lifestyle.

Zeo knows what Jiwon is up to, and finally spills the beans to Rawon that his brother is more than just a hoodlum troublemaker on the outside. That he's secretly in a world of underground trouble as Editor K. He even previously let Jiwon purposely see them make out for fuel to the fire.

Rawon confronts Jiwon; and they make a deal. In exchange for Jiwon quitting his dangerous job and going to military service, Rawon has to quit Songhyeon and stop seeing Zeo. Rawon eventually does quit his job and decides to see Zeo one last time...and possibly also one more tryst.

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Side notes:

We know that Sejeong, Julia, and Jiwon want to take down Chairman Kang because he killed their loved ones. We don't actually know yet Zeo's motives for wanting to takeover Hyeon Group; nor his relationship with his adoptive father.
But presumably, it seems that both fathers have been doing shady things. Chairman Hyeon is absorbing and overtaking small companies, bringing them to ruin.

Whatever gossip report Jiwon has on Zeo is likely alleged without hard evidence, because it feels as though Zeo knows, and may actually have predicted for this to happen, as he's still in partnership with Sejeong for their "revenge". It is likely that he deliberately edged Jiwon on purpose to pull Rawon and himself out of the danger zone while he finishes the last phase of his plans.

Zeo and Rawon are mutually in love. Rawon doesn't have any confidence a relationship with a conglomerate rich beau would ever work out in seriousness; so he's half-heartedly in the relationship as a casual fling. Meanwhile, Zeo is most likely serious but he has a lot on his plate he needs to clean up first; what with the whole corporate takeover. Aside from that, their relationship is actually decent.