This is because he likes you truly and feels that she is responsible in which you as protector and escort for whatever the need be from your side.
These things were recognized as "poessy rings" or "love poem rings" which in fact had few saying or lines of poems engraved upon them. https://y5Mm5gbaz5iwj2ptsgtddlciwho63Asbqcjros5x4Qn5znillw6a.cdn.ampproject.org/c/s/Conference.Krta.Or.kr%2Fbbs%2Fboard.php%3Fbo_table%3Dfree%26wr_id%3D8018/