This article is one of the writing series on the transmission from Buddhadāsa Bhikkhu’s idea of Dhammic Socialism to Sulak Sivaraksa’s engaged Buddhist practice. The present article is tried to study the intellectual connection between two individuals’ essential ideas, through particular aspects. The continuity, development, differences, even the tension between the two key figures of Engaged Buddhism in Thailand. How Sulak Sivaraksa’s radical practice can adopt Buddhadāsa Bhikkhu’s without conflict is a point deserved to be concerned for further analysis, since Buddhadāsa’s idea of Dhammic Socialism is famous for the internal tension grown between its conservative and more liberal aspects. The article is composed of three sections. Firstly, comparative description on Buddhadāsa and Sulak’s intellectual growing path. Secondly, analysis on selected aspects from Dhammic Socialism. Thirdly, Sulak’s critical developing of his master’s idea by Engaged Buddhist practice. Current study on Buddhadāsa will be discussed and responded.