Dreaming Back to the Three Kingdoms: The Nine-Turn Spirit Bracelet

The protagonist is an orphan, though that's not quite accurate: strictly speaking, he has amnesia and has forgotten his past. He now works as a tour guide. By chance, he meets a tourist who tells him his name is Cao Meng. Cao Meng's granddaughter, Cao Ying, also wears a unique bracelet. Through a twist of fate, the protagonist transmigrates back to the Three Kingdoms era.