Description taken from Cross Infinite World:
A tsundere love story!

Chloe is an alchemist of (self-proclaimed) rare beauty. She used to be the esteemed daughter of a duke, but three years ago her engagement was suddenly annulled and she was stripped of her title and privileges! With nowhere else to go, she decided to become an alchemist’s apprentice until she becomes rich enough to have her own alchemy shop in the royal capital.

Now a penny-pincher, Chloe goes out of her way to purchase Julius, the former general of an enemy kingdom, who was dubbed the Black Prince for his cruel nature and cold-heartedness! She purchased him to be her bodyguard so she can more efficiently gather materials for alchemy, but his personality is just awful. And yet, Chloe finds herself slowly drawn to Julius despite his incessant teasing...

What kind of love will bloom between this gorgeous alchemist and her snarky, tsundere general?!