If you're looking for manga similar to Love in the Mask, you might like these titles. All recommendations are made by Anime-Planet users like you!
Yooi is a poor yet optimistic girl who lives from hand to mouth and wants nothing more than to pay off her father’s debts so they can be a family again. Lida is a rich, stuck-up heiress whose life of privilege has left her heartless and feeling entitled to get whatever she wants. While these two girls would seem to have nothing in common, they share one identical thing: their appearance. And since Lida has been getting death threats, she hires Yooi to be her body double. Yooi is eager to earn the money, but soon finds herself in the path of danger, and in the arms of Lida’s fiancé – a man she’s steadily falling in love with...
In addition to both being manhwa, they have a pretty similar feel - a girl must act as a boy and also a badass fighter, with plenty of danger in the way. Beyond that the stories aren't very similar, but I do think fans of one would appreciate the other.
Both put a huge accent on the pain, suffering and struggle the girls must go through in order to get their happily ever after. During the trails both girls are willing to sacrifice themselves(numerous times) for their loved ones but the stubborn prince charming never gives up their undying love.
Mizuki Ashiya is a teen Japanese girl growing up in the USA. After seeing Japanese track star Izumi Sano on TV one day, she became instantly enamored with his grace and style, and became determined to find him and confess her love. She's able to transfer to his all-boys school by hiding her feminine identity, and finds herself as his roommate in the process. However, while the rest of her classmates simply suspect she's a very girly boy, Sano sees through her façade in time, and together they must try to keep Ashiya's true gender a secret. Now, Ashiya must not only try to confess to the man she loves, but also help him work through his personal issues and keep her secret safe from the school in the process!
Since nobody else has made any reccomendations, i thought i should... the girls in both of these manga must hide there true identity, even though Hana Kimi has a much lighter feel to it, Love in the Mask is also a really good manga, definetly more mature though.... i highly recommend them both, i cant wait to find out what happens next in Love in the Mask!