have a soft spot for someone/something

have a soft spot for (someone or something)

To have a particular fondness or affection for someone or something, often for reasons that hard to understand or articulate. I've always had a soft spot for cheesy action films—there's just an earnest goofiness about them that I like. Despite how troublesome he could be, the teacher had a soft spot for Daniel.
See also: have, soft, spot
Farlex Dictionary of Idioms.

have a soft spot for someone/something

COMMON If you have a soft spot for someone or something, you like them. The blond beauty has admitted having a soft spot for our future King. I've always had a soft spot for roses — my Dad used to grow them when I was a child.
See also: have, soft, someone, something, spot
Collins COBUILD Idioms Dictionary, 3rd ed.
See also:
  • have a soft spot for
  • have a soft spot for (someone or something)
  • have a soft spot for or an animal
  • have a soft spot for somebody/something
  • soft spot
  • a soft spot
  • take a liking to (someone or something)
  • take a fancy to
  • take a fancy to (someone or something)
  • take a fancy to somebody/something