[OSEN=Reporter Choi Yi-jeong] Singer Kim Jung-eun, formerly of the group Maronie, who received great love for the song 'Cocktail Love,' has put an end to her 20-year marriage. According to Kim Jung-eun's side on the 22nd, she recently finalized the divorce by mutual agreement with her husband, Mr. Choi, after careful consideration due to personality differences and undergoing the court-mandated cooling-off period. It was amicably agreed that Kim…