This paper has two goals. First, it aims to carefully examine whether a bi-clausal (movement) approach to -yo attachment in Korean Right Dislocation (RD) constructions is tenable. Yim (2013) argues that -yo marking on an RD-ed element lends support to what is called the 'bi-clausal' approach to RD in Korean. We present an issue and data that solicit reconsideration of Yim's view on the syntax of -yo attachment. In particular, the bi-clausal approach endorsed by Yim is shown to have difficulty capturing two types of coordinate structure, namely interwoven dependency and additive coordination. Second, we demonstrate that the availability of these two types of otherwise puzzling coordination in the RD construction involving -yo marking can be captured under a 'mono-clausal' approach, in conjunction with M-K Park's (2009) midway conjunction analysis, where External Remerge, originally suggested by de Vries (2009), is assumed to play a crucial role in building coordinate structure at issue.