A woman is rejoicing. She must be glad and happy to rejoice out loud in front of you like this.
"I'm so glad!" the woman shouts, "Because I found the key (き)!" You immediately start to wonder what "the key" is. The key to life? The key to learning Japanese? Then you see she's holding up some car keys.
Currently there are no similar looking kanji which exist in the WaniKani learning system