 Makore mana gare gare, Choi akakwanisa kupinda mumitambo miviri yekushambira mu2012 Summer Olympics muLondon nekubvisa FINA A-standard yekupinda nguva ye2:13.00 200 m munhu mumwechete uye 2:08.81 200 m butterfly kubva kuFINA World Championships muShanghai, China. Mumakwikwi emamita 200 emunhu mumwe chete, Choi akapedza kupisa kwechina munzvimbo yechitanhatu ne0.19 yechipiri kumashure kweGreat Britain Sophie Allen, achideredza nguva yake yeOlympic kusvika pa2:14.91. Akaisa makumi maviri nemana mumakwikwi ekutanga, uye haana kufambira mberi kuenda kuma semifainari. Kusiyana neOlympics yake yapfuura, Choi akanyoresa nguva yegumi inokurumidza ye2:08.45 mumamita 200 butterfly kuti awane nzvimbo yake kumasemifaira pamazuva ekutanga emangwanani. Choi akakundikana kupinda mumakwikwi ekupedzisira, sezvo akapedza hafu yekupedzisira aine nguva yechitatu-yakaderera ye2:08.32. 