I would say that there is not an exactly same word for honey/sweetheart in Korean. In dictionary, 여보(yeobo), 자기(jagi) were registered, but they don't include the meaning of honey/sweetheart. It is because traditionally, a husband and a wife were in a relatioship based on trust and respect rather than sweetness.

Yoebo

여친

I would say that honey/sweetheat meas the nam that each calls the lover. If you have a person loving you, the peson will call you honey/sweettheart. In Korea, we translate honey /sweettheart into 여보(yeobo), 자기(jagi), 애인(aein) Do you think that my answer help you understand? If you have any questions, Please leave a massege in my e-mail. thank you.