In October 2019, head coach Kim "KDG" Dong-gun's contract expired, and he did not re-sign with the team.[1] Later that month, Seoul promoted assistant coach Park "changoon" Chang-geun to head coach and brought up Mun "MMA" Seong-won from Gen.G Esports as an assistant coach.[2] The team released assistant coach Lee "WhyNot" Ju-hyeop in early November.[3] On November 8, Seoul signed former Washington Justice head coach Kim "WizardHyeong" Hyeong-seok as a strategic coach.[4]
The Dynasty enter the new season with three free agents, one player which they have the option to retain for another year, and six players under contract.[7] The OWL's deadline to exercise a team option is November 11, after which any players not retained will become a free agent. Free agency officially began on October 7.[8]
The Dynasty's first acquisition of the offseason was on October 22, when they agreed to acquire tank Hong "Gesture" Jae-hee and DPS Park "Profit" Joon-yeong from the London Spitfire.[9] A week later, support Kim "Creative" Young-wan was promoted from Seoul's academy team Gen.G Esports.[6] On January 12, the Dynasty announced the signing of former London Spitfire support player Choi "Bdosin" Seung-tae.[10]
The first player to depart from the Dynasty was main support Lee "Jecse" Seung-soo, as he was released from the team on November 1.[3] Two weeks later, it was announced that Seoul transferred DPS Kim "Fleta" Byung-sun to the Shanghai Dragons.[11] On November 23, it was announced that support Lee "Highly" Sung-hyeok had been signed to the London Spitfire.[12] On November 27, veteran support player Ryu "ryujehong" Je-hong was signed to the Vancouver Titans,[5] and three weeks later, Seoul parted ways with off-tank Kim "zunba" Joon-hyeok.[13]
In December 2019, the Dynasty announced that they would hold two homestand events; both were to be held the Dongdaemun Design Plaza in Seoul.[14] Due to the COVID-19 pandemic in South Korea, the league cancelled the Dynasty's March homestand event that was initially set to be held from March 7 to 8. The game will be made up, with exact dates and times to be announced later.[15]