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Drama production label Mountain Movement Story told news outlets on May 12, "Park Hae Jin plans on appearing in drama 'Four People' as the male lead. 'Four People' is a project, which has been in the works for a long time, similar to 'Man To Man'. We are aiming to begin filming in the latter half of this year and a broadcasting station has yet to be determined." 

'Four People' is a mystery romance drama telling the story of a female detective who loses her lover and afterward discovers two sets of twins. Park Hae Jin will be acting out four individually different characters for the production.