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Both shows involve the FL returning to where she grew up after a fumble in life and falling in love with the ML who is loved by everyone in the town, while going on a journey of personal growth. Both shows involve comforting vibes with a touch of dark that highlights the comedy and advances the romantic story.

In the sinful city of Heyang, very well-liked Pan Yue married Yang Caiwei, who was despised by everyone. However, Yang Caiwei was murdered on their wedding day. The suspected culprit was none other than Pan Yue. Reborn from death, Yang Caiwei became known as "wicked woman" Shangguan Zhi.

She came back in a fierce attempt to expose Pan Yue's true colors. As they bravely confronted the Four Major Clans and uncovered many old cases, their hearts drew closer once more. Yang Caiwei discovered that the true culprit was not Pan Yue, who had loved her deeply all along and never betrayed her. Just as things seemed to be falling into place, the mastermind behind the scenes set another trap, pushing them into the abyss of despair. Will their love survive it all?

Jin Xiu, King of the Central Heavens, seeks to help camellia demon Hong Ning achieve immortality, but their fates intertwine unexpectedly. At the Flower Festival, Hong Ning confesses her love and desire to be his queen. Advised that demons and gods cannot be together, she pursues immortality. Upon her ascension, she discovers Jin Xiu is set to marry another. Heartbroken, she gives up immortality to enter reincarnation and forget him. Jin Xiu defies fate to ensure her rebirth, determined to protect her. As spring ends, they meet again, bound by love, trials, and destiny.

(Source: MyDramaList)

~~ Adapted from the novel "When Spring Ends, I'll See You Again" (???????) by Shu Ke (??).

Teacher student relationship!

Older female lead, and younger male lead!

Good drama! Edward Chen acting is very good

-FL is transported into a novel
-FL is considered a side character
-FL gets tangled with the original ML while rooting for the original heroine of the story
-ML also have cold and ruthless/possessive traits

There is a cold character and a very energetic character in both series. One of the main characters tries to make the other's life happier/easier in his own way. Later, the other main character starts to soften and become attached to him. Both characters have past relationships. They love going each others room/condo.

In both dramas, the leads meet friends in their own unique ways and embark on a journey together, facing all obstacles as a team and overcoming them through teamwork.

Complex female lead, well-written gray male lead, and a strong cast of richly developed side characters.

Both dramas are set in the Ming Dynasty and feature strong, independent female leads at the forefront.

Both dramas are set in the Ming Dynasty and feature strong, independent female leads at the forefront. Also, both of them are written by the same author.

Both dramas are set in the Ming Dynasty and feature strong, independent female leads at the forefront.

+ both dramas contain strong male and female leads
+ both dramas have supernatural elements
+ both dramas cover heart wrenching painful pasts and journey

Both have a strong mafia/gangsta element that keep the story going. The romance between the main character is chef's kiss in both series and if you love mafia groups "political" intrigues you will love both series

In both dramas the main characters do a job related to people that have recently passed away that consits of resolving mysterious deaths using technology as a way to bring closure to the case. Both use a computer program/software and work for an organization/company as the main theme of the show. The moral question arises as to whether it is right or not to look into people's personal information and secrets. They share two male protagonists plus a female support character. The two of them share the tsundere/cold vs innocent/kind trope dynamic and a close platonic relationship is formed between them.

Definitely if you liked Shopping King Louis / Shopaholic Louis you will like Attic Cat. And the other way around.
They are not the same in everything but they share a lot.
A rich man (without a house to live, for reasons) meets by chance a poor but clever and hardworking girl. They start living together on a rooftop. They need to be frugal but the MLs in both shows are kind of shopaholics and capricious. Sometimes they act like spoiled children and sometimes like lovely puppies
FL and ML soon become friends, and they are so close that they can't be far from each other even a day. They need to be together like the air to breath. In both dramas the FLs start working for a firm and they get close with their bosses, making the MLs jealous.

In Shopping King Louis there is a love triangle, while Attic Cat is more a love square.