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In Chapter 87 of the Romance, when Meng Huo rebels in the 3rd year of Jianxing (225), Zhuge Liang takes leave of the Later Sovereign, raises 500,000 troops of Shu and advances toward Yi Province. At this time Guan Suo, the third son of Lord Guan, comes to the army and says that after the fall of Jing Province he escaped the turmoil and recuperated at the Bao family manor, and that he had always wanted to go to Shu to see the late emperor and take revenge, but could not set out because his wounds had not healed. Now he has recovered, and having heard that his enemies in Wu have all been put to death, he was on his way to Xichuan to see the emperor when he met the army marching south. Zhuge Liang sighs and marvels at this, reports it to the court, and at once makes Guan Suo vanguard of the front division to join the southern campaign. Romance, Ch. 87 §2 · 7–8

In the same chapter Zhuge Liang explains that, having foreseen that Dongtuna and Ahuinan would flee by the shortcut along the mountain paths, he had Zhang Ni and Zhang Yi lie in ambush and had Guan Suo lead troops in support, and so captured the two. Romance, Ch. 87 §42–43

Zhuge Liang then has Wang Ping and Guan Suo lead a force together and gives them a plan. When Wang Ping flees after a few bouts with Meng Huo's general Mangyachang, Guan Suo too fights briefly and flees, falling back more than twenty li. While Meng Huo is in pursuit, Zhang Ni and Zhang Yi cut off his way back from both sides, and Wang Ping and Guan Suo turn their troops around and strike back, crushing the Man troops. Meng Huo, in flight, is captured by Wei Yan. Romance, Ch. 87 §45 · 47–49

In Chapter 88 Zhuge Liang has Lü Kai set up four camps on cool ground a hundred li from the Lu River and has Wang Ping, Zhang Ni, Zhang Yi and Guan Suo each hold one. When Meng Huo sends his younger brother Meng You to present treasures in a feigned surrender, Zhuge Liang summons Zhao Yun and Wei Yan, then Wang Ping, Ma Zhong and Guan Suo, and secretly gives them plans. On the night Meng Huo is captured for the third time, Guan Suo, together with Wei Yan, Ma Zhong and Wang Ping, brings in the captured chieftains of various caves. Romance, Ch. 88 §6 · 27–28 · 37

In Chapter 89 Zhuge Liang decides to abandon three camps and withdraw north of the river, and after distributing plans among his generals he assigns Guan Suo alone to guard the carts. After this scene Guan Suo never appears in the Romance again, and the Romance does not record his death. Romance, Ch. 89 §6–7