Michail Elgin and Alexandre Kudryavtsev were the defending champions, but decided not to participate.
Third seeds Lee Hsin-han and Peng Hsien-Yin won the title by defeating Brydan Klein and Yasutaka Uchiyama 6–7(5–7), 6–4, [10–4] in the final.
Sanchai Ratiwatana and Sonchat Ratiwatana successfully defended their title by defeating Yuki Bhambri and Divij Sharan 6–4, 6–4 in the final.
Sanchai Ratiwatana and Sonchat Ratiwatana were the defending champions, but they lost to Victor Baluda and Dino Marcan in the first round.
Baluda and Marcan defeated Samuel Groth and John-Patrick Smith 6–7(5–7), 6–4, [10–7] in the final to win the title.
Sanchai Ratiwatana and Sonchat Ratiwatana were the two-time defending champion, and successfully defended their title against Lee Hsin-han and Peng Hsien-yin 6–3, 6–4.
Lee Hsin-han and Peng Hsien-yin were the defending champions but lost to Huang Liang-Chi and Yang Tsung-hua.
Marin Draganja and Mate Pavić won the title over Lee Hsin-han and Peng Hsien-yin 7–5, 6–2.
Chen Ti and Peng Hsien-yin were the defending champions, but lost in the final.
Sanchai Ratiwatana and Sonchat Ratiwatana were the defending champions and successfully defended their title, defeating Nam Ji-sung and Song Min-kyu in the final, 7–6(7–2), 3–6, [10–7].
This was the first edition of the tournament.
Benjamin Mitchell and Jordan Thompson are the defending champions, but only Mitchell defending his title partnering Matthew Barton.
Gong Maoxin and Peng Hsien-yin were the defending champions, but Peng chose not to participate this year. Gong chose to partner with Yi.
Hsieh Cheng-peng and Yang Tsung-hua were the defending champions but chose not to participate together. Hsieh partnered Yi Chu-huan, while Yang partnered Jeevan Nedunchezhiyan. Yang lost in the first round to Wu Tung-lin and Zhang Ze. Hsieh lost in the final to Sanchai and Sonchat Ratiwatana 4–6, 6–7(4–7).
Tristan Lamasine and Nils Langer were the defending champions but chose not to defend their title.
Sanchai Ratiwatana and Sonchat Ratiwatana were the defending champions but only Sonchat Ratiwatana defended his title, partnering Yi Chu-huan. Ratiwatana lost in the semifinals to Daniel Masur and Ante Pavić.
Matt Reid and John-Patrick Smith were the defending champions but chose not to defend their title.
Sam Groth and Leander Paes were the defending champions but chose not to defend their title.
Stefan Kozlov and John-Patrick Smith were the defending champions but chose not to defend their title.
Sanchai and Sonchat Ratiwatana were the defending champions but lost in the first round to Gong Maoxin and Hsieh Cheng-peng.
Marin and Tomislav Draganja were the defending champions but chose not to defend their title.
In the 2018 Seoul Open Challenger Doubles tennis tournament, Hsieh Cheng-peng and Peng Hsien-yin were the defending champions but chose to defend their title with different partners. Hsieh partnered Christopher Rungkat but lost in the quarterfinals to Toshihide Matsui and Frederik Nielsen. Peng partnered Aliaksandr Bury but lost in the semifinals to Chen Ti and Yi Chu-huan.
Hsieh Cheng-peng and Peng Hsien-yin were the defending champions but chose to defend their title with different partners. Hsieh partnered Yang Tsung-hua and successfully defended his title. Peng partnered Yi Chu-huan but lost in the first round to Benjamin Lock and Rubin Statham.
Marin Draganja 
Joris De Loore 
Luke Saville 
