Cross Season 1 Episode 4 Episode 4 ( Air Date 2018-02-06 ) Genre Crime category. Overview "Kang In Kyu (Go Kyung Pyo) tries to refuse the invitation of Go Jung Hoon (Cho Jae-hyun), arousing the suspicions of Go Ji In (Jeon Sang-min) about how deep the relationship between Jung Hoon and In Kyu goes.".