The main purpose of the current study was twofold: (a) to examine the effects of intrusive rumination and deliberate rumination on posttraumatic growth and (b) to test the mediated moderating effect of psychological acceptance on posttraumatic growth. For this study, 334 South Korean adults completed questionnaires which included demographic information, K-ERRI, K-PTGI, and K-AAQ-II. After data cleaning, a total of 292 responses were analyzed by structural equation modeling. As a result, the initial model which hypothesized that deliberate rumination would predict present intrusive rumination was rejected. In addition, psychological acceptance had a moderating effect on the relationship between past intrusive rumination and present intrusive rumination. The implications for counselors and counseling researchers are discussed.