KitKat's manga / #Marriage contract(1)

Chap 19 Killed my step family, transmigration YoungerSelf Knows alchemy, turns objects to gold, revenge Goes into bad streets, finds a provocative seamstress Escorted by hero, mad dog, to the ball, protection Contract marriage, they spent the night together Step sis poisoned her at the ball, hair turned black The hero involved with a game to kill kings.