Lee took the first game by upping his attacking game in the final stretch as Liew battled to close the gap at 16-17.
Several cross-court smashes could only be watched by the 34-year-old as Lee finished off with a flurry to ease into the lead.
But Liew stormed back to level matters with a 21-13 victory in the second game to head into yet another three-game contest for Lee in this tournament.
Lee was not to denied of a second consecutive final, taking the deciding game with a comprehensive 21-14 win.
He would contend for the title against Li Shifeng, who overcame Kodai Naraoka in a marathon battle in the other semis.
Finals spot up for grabs as ?? Matsuyama/Shida square off against ?? Tan/Thinaah.#ThailandOpen2022 #BWFWorldTour pic.twitter.com/MxCfDanaaK
— BWF (@bwfmedia) May 21, 2022
Lee is the country's only representative in the final after Pearly Tan-M. Thinaah and Aaron Chia-Soh Wooi Yik both lost their matches.
Tan-Thinaah went down 17-21, 17-21 to Japanese pair Nami Matsuyama-Chiharu Shida, while Chia-Soh lost 19-21, 14-21 against Fajar Alfian-Rian Ardianto.
All the best, Zii Jia! #ThailandOpen2022
— Stadium Astro ? (@stadiumastro) May 21, 2022
Stream LIVE on @AstroGOmy: https://t.co/LB6Yrfd5yr pic.twitter.com/a6muibusbD