I Transmigrated to Ancient Times and Became a Maid

Ever since Shen Xin transmigrated into this alternate dynasty, she hasn't had a single peaceful day. Thanks to her rotten luck, she transmigrated as an invisible little maid, so every day she lives on tenterhooks, terrified she'll say something she shouldn't or do something she shouldn't, and get sold off by the household or beaten to death! Even though she's careful to the point of paranoia, she still lets slip things that don't fit this era now and then.

Actually, the family she serves is pretty nice. The master is kind, the madam is benevolent, and the young masters and ladies are all polite and well-behaved.

The only problem is, why does the Second Master keep watching me? Is he looking for an excuse to find fault with me and drive me away? I'd better stay far away from him. If I see him, I'll run!