SEOUL, South Korea — South Korean authorities began a second attempt on Wednesday to detain President Yoon Suk Yeol over his botched declaration of martial law, weeks after a first attempt ended in a dramatic standoff at the residence where Yoon has been holed up since being impeached.

Investigators arriving before dawn at Yoon’s presidential residence in central Seoul were met by members of his security service, who blocked them from detaining Yoon during their first attempt on Jan….