heartbreaker          
noun [ C ]  informal uk/ˈhɑːtˌbreɪ.kər/ us/ˈhɑːrtˌbreɪ.kɚ/
 万人迷(常指让人着迷又心碎的人)
an attractive person who is likely to make other people fall in love with them and make them feel sad
  At the time I met him he was a heartbreaker; he looked like James Dean. 在我遇见他的时候,他是个万人迷,看上去像詹姆斯·迪恩。 
  伤心事
something that makes someone very sad
  Knowing that I can't see my grandchildren, that's a heartbreaker for me. 知道见不到孙子孙女,这事让我心碎。 
 - More examples
 - He was featured in a People magazine cover story that dubbed him "TV's hottest heartbreaker."
 - They call you a heartbreaker and ask how you can possibly still be single.
 - He pinballs romantically between the smart, sensitive girl and the aloof heartbreaker.
 - They lost the title game because of that critical missed pass—an absolute heartbreaker.
 - I can tell you that this book is a beautiful heartbreaker.
 - He soon discovered that fame can be a heartbreaker.