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Incumbent president Lee Teng-hui served as vice president under Chiang Ching-kuo before he succeeded Chiang, who died in office in 1988. After Chiang's death, the struggle between different factions in the Kuomintang surfaced for Chiang's successor. While Lee Teng-hui and Lee Yuan-tsu received nominations from the party in February 1990, a ticket of Lin Yang-kang and Chiang Wei-kuo was also pushed forward by the other factions until Lin decided not to run on March 9.
Linda Chao and Ramon H. Myers, 1998. The First Chinese Democracy: Political Life in the Republic of China on Taiwan. Baltimore: The Johns Hopkins University Press, p. 192.