자기야 is the most common Korean terms of endearment.
우리 강아지 (u-ri gang-a-ji) Korean old people call their grandkids 강아지.
우리 which literally means our but it is used as my/ mine is also a Korean term of endearment.
막내 which means younger also expresses endearment in korean language.

korean terms of endearment list

난 네꺼야 (Nan Ne-kkeoya) means Im yours.
남자친구 (nam-ja-chin-gu) also means 남친 which means Boyfriend.
내 사랑 (nae sa-rang) means My love and it is used when writing a letter to their boyfriend or girlfriend.
내꿈꿔 (naekkumkwo) means see me in your dreams
너 생각 (no saenggak) means I’m thinking of you
만나고 싶어 (Mannago Sipeo) means I want to meet you.
보고싶어 (bogo shipo) means I miss you
부부 (bu-bu) means Married couple. It is used for calling some married couples.
사귀할래? (sagwihallae?) means let’s start dating
사랑해 (saranghae) means I love you
서방님 (seo-bang-nim) means Husband. Some older people still use this word.
아름답다 (areumdabda) means beautiful.
애인 (ae-in) means Sweetheart.
여보 (yeo-bo) means Darling/Honey used mostly between married couples.
여자친구 (yeo-ja-chin-gu) It is also called여친 which means Girlfriend.
연인 (yeon-in) means Couple. It is mostly used in writing.
예쁘네요! (yeppeuneyo!) means you are pretty.
예쁘다 (yeppeuda) means pretty
오빠 (o-ppa) means Honey. It is used by girls to older boys)
왕자님 (wang-ja-nim) means Prince.
자기야 (ja-gi-ya) means Baby or Honey. It is mostly used in Korean dramas.
짝사랑 (Jjak-sa-rang hae-sseo) means secret crush.
찡찡이 (jjing-jjing-i) is a Cute word for a girl who whines
첫사랑 (cheot-sa-rang-i-eot-da) means first love.
커플 (keo-peu-r) means couple.
키스/ 뽀뽀 means kiss.