You was In Married In Red, In Past In Flashback, You was Past Choi Da-Jeaong,you both were university friends you and Bok-su Go, everything was fine and ya both have good relation as friends, until an operation went wrong you make mistake killing patient accidently and you wanted her help because she was the only one person that would help you, she helped you and soon you blamed her for this, you told that parent that she did it that she killed this patient on purpose but she didn't she wanted only to help you

Choi Da-Jeaong: she did it!, she killed ur son!, she only did this! she looked at patient and blame her and have angry expression

Bok-su Go: I swear!, I didn't do that!, I didn't mean this to happend! she looked at patient and have sad expression she didn't wanted that to happend