N:1 관계에서 delete 질문있습니다.

@Entity
@Builder
@NoArgsConstructor
@AllArgsConstructor
@Getter @Setter
public class Member {

    @Id
    @GeneratedValue
    private Long id;

    @Column
    private String username;

    @ManyToOne
    @JoinColumn(name = "team_id")
    private Team team;
}

@Entity
@Builder
@NoArgsConstructor
@AllArgsConstructor
@Getter @Setter
public class Team {

    @Id
    @GeneratedValue
    private Long id;

    private String name;
}

try {
            tx.begin();

            Team team = new Team().builder()
                    .name("teamA")
                    .build();
            em.persist(team);

            Member member = new Member().builder()
                    .username("member1")
                    .team(team)
                    .build();
            em.persist(member);

            em.flush();
            em.clear();

            Member findMember = em.find(Member.class, member.getId());
            Team findTeam = findMember.getTeam();
            em.remove(findTeam);

            tx.commit();
        } catch (Exception e) {
            tx.rollback();
        } finally {
            em.close();
        }

findTeam을 remove하기 전에 findMember.setTeam(null) 이런 식으로 팀과의 연관 관계를 null로 만들고 삭제하지 않았는데 에러가 발생하지 않고, 데이터베이스에서 member 정보와 team 정보 모두 삭제됩니다.

CASCADE 설정이 되어 있는 건 아닌데 왜 이렇게 동작하는 걸까요??

Member findMember = em.find(Member.class, member.getId());
Team findTeam = em.find(Team.class, team.getId());
findMember.setTeam(null);
em.remove(findTeam);