have a soft spot for
US /hæv ə sɑft spɑt fɔr/
UK /hæv ə sɑft spɑt fɔr/

1.
甘い, 弱い
to feel a great deal of affection for someone or something
:
•
I've always had a soft spot for stray animals.
私はいつも野良動物に甘い。
•
She has a soft spot for her youngest grandchild.
彼女は一番下の孫に甘い。