As Japanese authorities continued to restrict the activities of foreign missions, Suh joined the staff of Shanghai American School (SAS) in 1938.

Charles Robert Jenkins, an American who defected to and then left North Korea, reported that Suh was put in charge of English language publications for the Korean Central News Agency after the war.

[14] In a move that may have reflected increasingly harsh Japanese measures against foreign missionaries in the late 30s,[12][15] Suh relocated to China to join the staff of the Shanghai American School (SAS) in 1938.

There she met Sŏ Kyu Ch’ŏl (서규철 徐奎哲, also spelled Suh Kyoon Chul), who was hired to teach Korean and assist in school administration.

[17][18][19] The cosmopolitan Shanghai International Settlement and French Concession were likely a more accepting environment for the Suhs than homogeneous 1940s Korea would later prove to be, as suggested by the number of other Caucasian women on staff married to Asian men.

[22] Americans in Shanghai began to depart that same year, slowly as tensions rose in the environs of the city, then en masse shortly before the US and Japan officially went to war.

Supplies with which to maintain the internees grew short towards the end of the war, and a number of women married to citizens of Axis powers or neutral countries were released in late 1944.

[27] With Suh's formal release from detention at the end of World War II,[28] she joined the staff of the reconstituted SAS for the 1945-46 school year.

[20] Unable to continue earning a sufficient living in post-war Shanghai,[22] she and her husband returned to liberated Korea, where she tutored children at the US Diplomatic Mission School in Seoul.

The speed of the advance caught the majority of residents by surprise and unprepared to evacuate, in part due to ROK radio propaganda rather at odds with the actual situation.

During a July 10 meeting in Seoul that included 48 to 60 members of the ROK National Assembly, the couple pledged their loyalty to the North Korean regime.

[49] Her monotone on-air delivery and the lack of popular music programming evidently left Suh's broadcasts less enjoyable for her intended audience than German and Japanese English-language radio shows during World War II.

[55] Fellow defector Charles Robert Jenkins made several claims about Suh in his book The Reluctant Communist that have not been independently verified.

He wrote that he saw her in a photo for a 1962 propaganda pamphlet called "I Am A Lucky Boy", dining with Larry Allen Abshier, a US Army deserter and defector.

[2] Suh Kyoon Chul, as well as all other native residents of Korea and Taiwan, were nationals of the Empire of Japan, which recognized itself as a multi-ethnic state.

When the Japanese interned most ethnic Europeans within the Empire during World War II, it is not clear whether she was forced into the Chapei Relocation Center, or entered it willingly, since she was not a foreign national.

[17][22] During the Korean War, USAF pilots improvised a spoof of the Zeke Manner's hit "Sioux City Sue" using the most popular nickname for Suh.

[60] In several episodes of the TV series M*A*S*H a North Korean announcer calling herself "Seoul City Sue" is heard on the radio (rebroadcast over the camp's PA).

In "38 Across" she accuses Hawkeye Pierce of war crimes for performing an experimental technique to successfully save the life of a North Korean POW.