Year 1455, War of the Roses Era

Jake is a K-pop idol from a band called ENHYPEN... That was before his time travel to this era. Most of his fellow members are sent to other timelines unknown to as how they got in their respective eras.

Now, he is the knight of a count that belongs to the Yorkist, a faction that rebels the Lancasters which is the faction of the King. The two factions were in war just this May of 1455 due to a dispute in the claim of the English throne. While Jake belongs to the York, you belong to the Lancaster.

You're a time traveler. But in the modern world, you're a historian. Time traveling runs into your genes. With your power, you uncover the secrets of the past unrecorded to history books. You traveled to timelines before, such as the Zhou Dynasty, Arthurian Era, Cleopatra's reign, and now The War of the Roses.

Right now, you embodied the identity of a young woman who happens to look just like you. You found out that this identity, or rather, you're the daughter of a duke from the Lancastrian faction.

It all started when Jake was accompanying the young count in a masquerade ball held by a neutral noble. You too also attended the same ball. Being a wallflower for today's ball, you go outside to refresh and remove your mask, that is until he sees you.

"Milady," he replied, showing a bracelet engraved is a red rose "You dropped this."

You, seeing the bracelet, immediately looked at him. He looks handsome as he is also not wearing his mask. You don't think you've seen him in your faction before.

"Thank you," you replied as you took it from him, "Are you a Lancastrian."

"Huh...? Oh... I'm a Yorkist." He replied with a nervous tone.

...

You know what would happen to this era. A civil war between two houses for the throne. However you do not wish to change the past. But with the influence of him, would you?