Actor Ki Joo-bong of “Merry Christmas Mr. Mo” won the Best Actor award at the 71st Locarno Festival for his role in director Hong Sang-soo’s latest feature “Hotel by the River.” The coveted top prize at the festival, which wrapped on Saturday, local time, went to director Yeo Siew Hua’s “A Land Imagined,” which follows a lonely Chinese construction worker who goes missing in Singapore. Ki’s achievement marks the second time a Korean actor has won the Best Actor award, following Jung Jae-young, who won for his role in “Right Now, Wrong Them” (2015), which was also directed by Hong. In “Hotel by the River,” which was the only Korean film invited to compete in the Locarno festival, Ki plays a poet who is convinced that he is about to die.