▁stra ined ▁when ▁Call ie ▁is ▁led ▁to ▁believe ▁H ahn ▁has ▁rom antic ▁designs ▁on ▁her . ▁Although ▁H ahn ▁laugh s ▁off ▁the ▁notion , ▁she ▁goes ▁on ▁to ▁kiss ▁Call ie ▁in ▁front ▁of ▁Slo an , ▁to ▁prove ▁that ▁he ▁couldn ' t ▁handle ▁a ▁th rees ome ▁with ▁the ▁two ▁of ▁them , ▁leaving ▁Call ie ▁st unn ed . ▁In ▁the ▁season ▁four ▁finale , ▁Call ie ▁initi ates ▁a ▁second ▁passion ate ▁kiss , ▁which ▁H ahn ▁reci proc ates . ▁The ▁two ▁attempt ▁a ▁rom antic ▁relationship , ▁but ▁while ▁Er ica ▁comes ▁to ▁terms ▁with ▁her ▁sexual ity ▁quickly , Call ie ▁is ▁slightly ▁confused ▁with ▁her ▁sexual ity ▁because ▁it ▁didn ' t ▁feel ▁right ▁doing ▁it ▁with ▁H ahn ▁so ▁she ▁quickly ▁goes ▁and ▁sle eps ▁with ▁Slo an ▁to ▁learn ▁how ▁to ▁sleep ▁with ▁Er ica ▁H ahn ▁ ▁Development ▁ ▁Cast ing ▁and ▁creation ▁ ▁Er ica ▁H ahn ▁was ▁initially ▁conce ived ▁as ▁a ▁minor ▁character , ▁and ▁occas ional ▁guest - star ▁rival ▁of ▁Pr eston ▁Bur ke ▁( Is a iah ▁Washington ). ▁The ▁character ▁first ▁appeared ▁in ▁three ▁episodes ▁of ▁the ▁show ' s ▁second ▁season , ▁followed ▁by ▁another ▁two ▁episodes ▁of ▁the ▁show ' s ▁third ▁season . ▁Disc uss ing ▁whether ▁she ▁thought ▁H ahn ▁might ▁become ▁a ▁main ▁character ▁after ▁her ▁season ▁three ▁appearance , ▁Smith ▁has ▁stated ▁that ▁at ▁the ▁time : ▁" I ▁didn ' t ▁really ▁think ▁it ▁was