A Korean Night is an earlier Sailor Costigan draft connected with the “Yellow Cobra” story sequence. Surviving agency material shows the Costigan story later altered into a Dennis Dorgan version, with names and the credited author changed in the typescript and in a subsequent clean copy. A Korean Night preserves an earlier Costigan form.

REH sent Otis Adelbert Kline a finished typescript entitled "Sailor Costigan and the Yellow Cobra." This typescript was first corrected, and then later changed into the Dennis Dorgan story "Sailor Dorgan and the Yellow Cobra" by Patrick Ervin. It was sold to Magic Carpet Magazine, but never published by them. The typescript at the Cross Plains Library is Howard's, but correction tape has been used to change Howard to Ervin, Costigan to Dorgan, Mike to Spike, The Sea Girl to The Python, etc.) Still, later, a "clean copy" was produced that incorporated all the changes and corrections.

There is also an original Costigan typescript, titled "The Fangs of the Yellow Cobra."
"A Korean Night" is a slightly different, earlier original draft of the Costigan version.