a strange girl appears before Luhan one night covered in blood as she faints in his arms. The girl appears to be normal, but has lost all of her memories. She is barely able to communicate with others and becomes attached to Luhan. When strange organization known as The Numbers start  attacking this girl Luhan learns that there is more to her than meets the eye.

MAIN:

The mysterious girl that meets Luhan one night. After her escape she struggles to get away from her pursuers. She manages, but ends up fainting in Luhan's arms. She later receives the name Lulu

Luhan the calm and mature member of the group Exo. Immediately tries to take care of the mysterious girl that has come into his life.

MINOR:

Sehun and Tao, the maknaes. They don't always see eye to eye and are constantly arguing with one another. Sehun is hesitant at first when he sees Lulu, but accept her as an older sister. Tao is able to put a smile on her face when she is feeling sad.

The calm leader of Exo K, would rather try and talk things out than start a fight with the members. Lulu see's him as a motherly figure and occasionally follows him and D.O to the super market.

D.O, initially the member who is the hardest to approach and keeps his distance from Lulu. He grows attached after she eats a meal he has made and is the only one she let's call him D.O mama.

Baekhyun,one of two member besides Luhan who can calm Lulu when she gets upset.

Kai and Kris, members who strongly oppose Lulu staying with Luhan and Sehun. Later on Kris becomes the only member besides Luhan that Lulu will follow orders from. Kai is the only member who remains awkward with Lulu and doesn't like being left alone with her.

Chen one of the members that readily accepts Lulu into their family. One of the most comfortable members around Lulu. She sees him as brother.

Xiumin, the member who is easily attached to Lulu. He usually the one that buys her whatever she wants. Treats her like his little sister.

Lay, the other member besides Baekhyun and Luhan able to calm her down when she gets upset. She like playing with his hair and normally ties it in a bow, which he allows since it's one of the ways to calm her.

Chanyeol, the goofy member. He's normally trying to make her laugh, but never works. He grows to like her, but she brushes it off as a joke on multiple occasions.