The Shameless Sickly Man and the Abandoned Girl Summoner

This is a one-on-one romance with loyal, devoted leads, so dive in without worry. In her previous life, she was Number Five, a superpowered member of an international assassin organization. To avenge her adoptive parents, she chose to go down with the organization.

After transmigrating, she awoke as Hong Yue, the disgraced young lady of the Hong family, whom everyone bullied.

To avenge the body she now occupied, she swore an oath to Heaven to kill the vile usurpers who had stolen everything from its rightful owner.

Her hard work paid off. With a single talisman, she burned to ashes the servant who had slapped her and the family patriarch's concubine who had whipped her.

After that, she changed her name, disguised herself, and went undercover.

She wasn't a coward.

All her patience and restraint were merely preparation for her eventual comeback.

What? You say she's useless?

How ignorant!

Her elements simply couldn't harmonize, and she hadn't found a suitable cultivation technique.

She is a hidden, all-element summoner!

Hm? You say she's hideously ugly?

Nonsense!

She only disguised herself as a plain-looking man to avoid drawing attention.

A pearl is merely covered in dust for now. Who gave you the right to call it a worthless pebble?

What? You say she has no feelings?

Ha, woman, where does that leave the ten-thousand-year-old Demon Lord?

What? You also say the person she likes is just as useless as she is?

Ha, do you know who he is? The only all-element mage in ancient history, who rides a true dragon.

Hm? You all say the person she likes is a great demon?

This time, she didn't argue.

So what if he is?

In her previous life, she was an assassin too, but she only killed evil people.

A great demon with the full range of human emotions, who lives as he pleases, is far more lovable in her eyes than a hypocritical saint who never stops preaching about benevolence and morality.

Everyone likes a different kind of synopsis, so I'll be waiting for you in the story itself.