be all sweetness and light

Từ điển Oxford Advanced Learner 8th

be (all) ˌsweetness and ˈlight idiom
1. (of a person)to be pleasant, friendly and polite
•I can't complain— he's been all sweetness and light with me.
2. (of a situation)to be enjoyable and easy to deal with
•It's not all sweetness and light being an actor.
Main entry: ↑sweetness_idiom